Thanks for the answers, I used the time to better understand gts/gtx terminology and compare it to prices.
Power supply burned out a few days ago, now it's Chieftec 750W, it will not be a bottleneck.
I will be buying in local shops in Serbia. As I understand my range is gts450 (prices are 80+ eur for 1gb models), gtx 460 (130+ eur) and if there is a really, really good reason GTX560 (without SE in name prices begin with 140+).
Brands that are most common are Gainward, Palit, Asus, Leadtek and MSI.
What would you suggest?
I am afraid that GTS could be too weak on the long run, but GTX460, some 1GB model would be more suitable perhaps