Reasonable GPU upgrade for i5 650 pc futureproofing VS bottleneck

[Jarkiko]

Hi all.
I would like to ask experts opinion about upgrading GPU for my 2 year old i5 650 PC.

I dont really understand this bottle neck problem so that is why i ask how much future proofing is reasonable to enjoy gaming without too bad bottleneck.

APPROXIMATE PURCHASE DATE: ASAP BUDGET RANGE: 400-450$ (300-350€)

USAGE FROM MOST TO LEAST IMPORTANT: Only for gaming at 1650x1050 or 1920x1080
Sinlge monitor usage only atleast for now maybe in future more.
Preferable at max settings or close with good fps. I hope to be able to play games like SWTOR, bioshock infinite, crysis 3, skyrim and hopefully elder scrolls online when ever its released.

CURRENT GPU AND POWER SUPPLY: ATI Radeon HD 5570 and Corsair AX850 850W gold PSU

OTHER RELEVANT SYSTEM SPECS: i5 650 CPU, MSI-2a9c (MS-7613 (Iona-GL8E), 6GB DDR3 1333Mhz memory , 1,5 TB 7200 RPM, DVD/RW

CASE: Coolermaster HaF 912+ GPU length max of 15,4 inches 390mm


PREFERRED WEBSITE(S) FOR PARTS: I live in Finland where so i will be buying from finnish webstore.

PARTS PREFERENCES: I would prefer AMD card, but these are what i have been thinking HD 7950, HD7870, GTX 660 ti ,GTX 660 i have also been looking for older generation cards but prices of used cards in Finland are so ridicilous that i think i rather buy new and get quarantees and maybe those never settle reloaded games too.

These couple i have been thinking... but also HIS and Sapphire ones
and gtx 660 and 660 ti.

http://www.gigabyte.com/products/product-page.aspx?pid=4367#sp


http://www.gigabyte.com/products/product-page.aspx?pid=4154#sp


OVERCLOCKING: Maybe in future
SLI OR CROSSFIRE: Maybe in future

MONITOR RESOLUTION: at the moment wich i am happy with 1680x1050,
but i also have other monitor with 1920x1080. Which ever brings the better fps and settings in games.

ADDITIONAL COMMENTS: SO there are the specs and my need.
My longer term plan is to get new GPU now and upgrade CPU, motherboard, memory and SSD later dont know how soon hopefully this year.
Already have upgraded my case and PSU.

Edit: I don´t know if it matters but i am not sure if my memory is 1333mhz after all cpu-z program shows it this way.

http://imageshack.us/photo/my-images/824/memoryn.png/

 

[Joshua Omote]

I would recommend a MSI Twin Frozr IV GTX 660ti Power Edition. Reason being it wipes out a 7850 and 7870. It also supports Triple Over Voltage which will allow you to push it to the limits of its overclock and probably match up to a 7950. If not any 660 ti would be better. If not the 660ti a 7970 would be better but the Gigabyte 3x cooler is pretty loud.