Update memory in 2006 iMac...should I bother?

Question

I'm not sure exactly which iMac I have..it says it's a 5,1 but that doesn't seem to fit the categories. It's intel, has a CD slot, and two 512 667MHz memory dealies.
So it seems pretty sluggish lately, even though I've transferred my photo library to my Time Machine backup ext. disk, and that did help.
So is it worth it to buy the max of memory, which is just 2gigs, I think? After 6 years am I heading for a demise anyway?
Any advice is welcome! Thanks.

Answer 1

MichelPM, you have complicated my Maclife! Here is what I have under hardware overview:
Model Name:
iMac
  Model Identifier:
iMac5,1
  Processor Name:
Intel Core 2 Duo
  Processor Speed:
2.16 GHz
  Number Of Processors:
1
  Total Number Of Cores:
2
  L2 Cache:
4 MB
  Memory:
1 GB
  Bus Speed:
667 MHz
  Boot ROM Version:
IM51.0090.B09
  SMC Version (system):
1.9f4
  Hardware UUID:
00000000-0000-1000-8000-0016CB9E1E35
I just discovered that I can indeed play a DVD, but whether I can burn one--have no idea. I'll see whether I can figure that out. I think I put CD in my first post because I knew I had that, and can burn a CD--and that was one of the choices on the Apple site for 2006 models, as you know. You are dealing with a member of the platinum age here. As in hair color.
Meanwhile, I should add that we bought this through the Apple education store--we both work/ed at the university.