Question on MacPro Using VGA

Hi. I have a MacPro1,1 and an older Sony LCD vga display that maxes out at 1280 x 1024. I just switched from a 5' vga cable to a 15' vga cable and have a marked decrease in picture quality.
Here's my question: I'm using a pretty cheap 15' vga cable; in anyone's experience, would a better-quality cable improve the monitor picture image?
Or, if I get a newer 1920 x 1200 monitor with DVI, would it look OK with 15' of cable?
Thanks for any input.

Switched to DVI cable, looks great at 15'.

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Exported EDID from SwitchResX:
{quote}DDC block report generated by SwitchResX version 4.1.6 for display
------------------- RAW DATA ------------------------
0 1 2 3 4 5 6 7 8 9 A B C D E F
0 | 00 FF FF FF FF FF FF 00 4A AE 00 02 01 01 01 01
1 | 1E 0C 01 03 6E 24 1B 78 EA 8A 01 9A 58 52 8B 28
2 | 1E 50 54 FF FF 80 61 40 61 4F D1 C0 71 4F 81 4F
3 | 81 59 81 99 A9 40 BC 1B 00 BA 50 20 1C 30 30 20
4 | 36 00 44 0A 20 20 20 20 00 00 00 FF 00 31 0A 20
5 | 20 20 20 20 20 20 20 20 20 20 00 00 00 FD 00 2B
6 | 55 14 5C 0E 00 0A 20 20 20 20 20 20 20 00 00 FF
7 | 00 30 30 30 30 30 31 0A 20 20 20 20 20 20 00 B0
< 00FFFFFF FFFFFF00 4AAE0002 01010101 1E0C0103 6E241B78 EA8A019A 58528B28 1E5054FF FF806140 614FD1C0 714F814F 81598199 A940BC1B 00BA5020 1C303020 3600440A 20202020 000000FF 00310A20 20202020 20202020 20200000 00FD002B 55145C0E 000A2020 20202020 200000FF 00303030 3030310A 20202020 202000B0 >
{ 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x4A, 0xAE, 0x00, 0x02, 0x01, 0x01, 0x01, 0x01, 0x1E, 0x0C, 0x01, 0x03, 0x6E, 0x24, 0x1B, 0x78, 0xEA, 0x8A, 0x01, 0x9A, 0x58, 0x52, 0x8B, 0x28, 0x1E, 0x50, 0x54, 0xFF, 0xFF, 0x80, 0x61, 0x40, 0x61, 0x4F, 0xD1, 0xC0, 0x71, 0x4F, 0x81, 0x4F, 0x81, 0x59, 0x81, 0x99, 0xA9, 0x40, 0xBC, 0x1B, 0x00, 0xBA, 0x50, 0x20, 0x1C, 0x30, 0x30, 0x20, 0x36, 0x00, 0x44, 0x0A, 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xFF, 0x00, 0x31, 0x0A, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xFD, 0x00, 0x2B, 0x55, 0x14, 0x5C, 0x0E, 0x00, 0x0A, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0xFF, 0x00, 0x30, 0x30, 0x30, 0x30, 0x30, 0x31, 0x0A, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x00, 0xB0, }
Valid EDID block: checksum passed
------------------- MAIN EDID BLOCK -----------------
EDID Version........1.3
Manufacturer........RUN
Product Code........2 (0002) (0200)
Serial Number.......01010101
Manufactured........Week 30 of year 2002
Max H Size..........36 cm
Max V Size..........27 cm
Gamma...............2,20
Display Supported Features:
Power Management: Active off Power Management: Suspend Power Management: Standby
Display type:
RGB color display
Display is non continuous frequency
Default color space is not sRGB standard
Preferred timing mode includes Native Pixel Format
Input signal & sync:
Analog input with: 0.700V / 0.000V
Sync on green
Separate Sync
Composite Sync
Color info:
Red x = 0,604 Green x = 0,322 Blue x = 0,156 White x = 0,312
Red y = 0,344 Green y = 0,545 Blue y = 0,117 White y = 0,329
Established Timings:
720 x 400 @ 70Hz
720 x 400 @ 88Hz
640 x 480 @ 60Hz
640 x 480 @ 67Hz
640 x 480 @ 72Hz
640 x 480 @ 75Hz
800 x 600 @ 56Hz
800 x 600 @ 60Hz
800 x 600 @ 72Hz
800 x 600 @ 75Hz
832 x 624 @ 75Hz
1024 x 768 @ 87Hz
1024 x 768 @ 60Hz
1024 x 768 @ 70Hz
1024 x 768 @ 75Hz
1280 x 1024 @ 75Hz
Manufacturer Reserved Timings:
1152 x 870 @ 75Hz
Standard Timing Identification:
#0: 1024 x 768 @ 60Hz (6140)
#1: 1024 x 768 @ 75Hz (614F)
#2: 1920 x 1080 @ 60Hz (D1C0)
#3: 1152 x 864 @ 75Hz (714F)
#4: 1280 x 960 @ 75Hz (814F)
#5: 1280 x 960 @ 85Hz (8159)
#6: 1280 x 1024 @ 85Hz (8199)
#7: 1600 x 1200 @ 60Hz (A940)
Monitor Description blocks:
Descriptor #0 - Timing definition:
Mode = 1280 x 800 @ 58,492Hz
Pixel Clock............. 71,00 MHz Non-Interlaced
Horizontal Vertical
Active.................. 1280 pixels 800 lines
Front Porch............. 48 pixels 3 lines
Sync Width.............. 32 pixels 6 lines
Back Porch.............. 106 pixels 19 lines
Blanking................ 186 pixels 28 lines
Total................... 1466 pixels 828 lines
Scan Rate............... 48,431 kHz 58,492 Hz
Image Size.............. 580 mm 10 mm
Border.................. 32 pixels 32 lines
Seq Stereo (Rt. Sync = 1)
Sync: Analog composite with Sync on green
Descriptor #1 - Serial number:
1
Descriptor #2 - Monitor limits:
Horizontal frequency range.......20-92 kHz
Vertical frequency range.........43-85 Hz
Maximum bandwidth unspecified
Descriptor #3 - Timing definition:
Mode = 0 x 816 @ 1,452Hz
Pixel Clock............. 0,32 MHz Non-Interlaced
Horizontal Vertical
Active.................. 0 pixels 816 lines
Front Porch............. 48 pixels 35 lines
Sync Width.............. 48 pixels 33 lines
Back Porch.............. 159 pixels -20 lines
Blanking................ 255 pixels 48 lines
Total................... 255 pixels 864 lines
Scan Rate............... 1,255 kHz 1,452 Hz
Image Size.............. 544 mm 32 mm
Border.................. 32 pixels 32 lines
Seq Stereo (Rt. Sync = 1)
Sync: Analog composite with Sync on green
{quote}
Can you evaluate these details? Am I good to go?

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