Service Dpt. got troubles repairing my mac and give me alternative options.. What option should I choose? Help!

Question

I got a MacBookPro few months ago (October 2011)
                   17-inch, Early 2011
Processor  2.2 GHz Intel Core i7
Memory     4 GB 1333 MHz DDR3
Graphics   AMD Radeon HD 6750M 1024 MB
Software   Mac OS X Lion 10.7.4
But for multiple issues I had to take it back. After several repairs, they offered me the three options below as the 17-inch MBP is discontinued(?).. Which one should I choose?
The main reason I want a 17-inch screen is that I am working with graphics and also I move often, so I can't afford carrying an iMac around.
1. Replace the unit with this 15-inch Macbook Pro - this would take approximately 2 weeks to arrive
15-inch MacBook Pro
• Part number: Z0MV
• 2.3GHz Quad-core Intel Core i7, Turbo Boost up to 3.3GHz
• 4GB 1600MHz DDR3 SDRAM - 2x2GB
• 128GB Solid State Drive
• SuperDrive 8x (DVD±R DL/DVD±RW/CD-RW)
• MacBook Pro 15-inch Hi-Res Antiglare Widescreen Display
• Backlit Keyboard (US) & User’s Guide (English)
• Accessory Kit
2. Replace the unit with a 15-inch Macbook Pro Retina - this could take approximately 4-6 weeks
15-inch: 2.3GHz Retina display
2.3GHz quad-core Intel Core i7
Turbo Boost up to 3.3GHz
8GB 1600MHz memory
256GB flash storage1
Intel HD Graphics 4000
NVIDIA GeForce GT 650M with 1GB of GDDR5 memory
Built-in battery (7 hours)2
3. We repair your unit in store as soon as possible.
Can you help me out please?
1) I am afraid that if I choose the third option, I won't be able to fix my MBP in the future in case that there are no spare parts (for example, if I get problems with the screen).
2) I don't understand how equal are the three models based on their prices...

Answer 1

"Another reason that makes me worry, is that I may go live in a country which doesn't have an Apple Store. (but they do have Apple representative suppliers)."
Then what's the worry? Consider how long you intend to own this MBP. Figure 3 years. Buy AppleCare to make sure you're covered.You're obsessing about an issue that may or may not happen. This is just my opinion. The other opinions are, from what I read, based upon what each poster wants, not what you need. You've got to assess your own requirements.