It's like going to a store to look for jeans. Just different companies selling a slightly different variation of the same product to make money. The card you have linked is a regular 650, and you want the 650ti.
Newegg.com - EVGA 01G-P4-3650-KR GeForce GTX 650 Ti 1GB 128-bit GDDR5 PCI Express 3.0 x16 HDCP Ready Video Card
RAM is fine.
The difference in games could be 2-20FPS depending on what exactly it is you play and what CPUs you are comparing. If you're comparing a fast 8350 vs say the 3570k one game could be no difference and the next 10FPS. To spread a little more light on the subject you can look at my article which explains why.
Your CPU and modern games: A guide to those building.
To simply answer your question, you could go AMD to save cash but you would then have to put the money into a better GPU. It's the better route to go, but honestly if you were just gaming you could simply go with an i3 3220 to have Intel single threaded superior performance and still save about 100 bucks off the i5's price tag. Then you could get something like the 660ti which for sure would be the best bang for your buck. Honestly though, a 650ti would probably be just enough for your gaming needs.
"Resolution is just a number." #Ubisoft Origin/Steam
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