Even on a crippled system like that I suggest a 560 Ti, because that can be ported to your new Intel based system that you will need anyway.
How much of a difference are we talking about, between 560ti and 470/560? I'm not talking about the 560ti with 448 cores, its the normal ti with 384.
I also forgot to add the X6 to the processor. I'm not planning on changing the whole setup soon, even if the AMD doesn't support SSE4.1.
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Go with a 560 Ti even if it has 384 cores. This is because it can be ported to a newer, more current system. Also, future versions of Premiere after CS6 will require SSE 4.1 support just to even run at all.
As for the GTX 470 and GTX 560 (non-Ti), it's now a case of "penny-wise, pound-foolish" (or just plain "pound-foolish" in the case of the GTX 470). Between the plain GTX 560 and the GTX 560 Ti, you get what you pay for: The plain GTX 560 can achieve a performance score of only around 120 seconds in the MPEG-2 DVD test in PPBM5, while the GTX 560 Ti can do the same test in 90-ish seconds (both scores are on an i7-2600K system overclocked to 4.4GHz). The GTX 470, at least in its reference form, is now relatively slow for its relatively high power draw: That GPU tends to heat up nearly all the way to its maximum safe temperature during the MPEG-2 DVD test in PPBM5. As a result, the reference GTX 470 is barely faster than a non-Ti GTX 560 in that particular test.
Just a quick check...I found somebody selling his gtx580 for 260€...I guess this would be the best choice/value for money atm? Also, prices dropped a bit and I can get 560ti for 185€ new. The used one is also no longer covered by warranty. I guess the 580 is still the way to go, right?