Pretaktovac :
According to this review
http://goo.gl/Kj1CN seems very good, but is there any similar Radeon which I preffer?
Yeah that's a really nice card, there is nothing from the AMD side as of now that can match a 780 in single GPU performance. You can also overclock a 780 to almost reach stock Titan performance, making it a marginally better Value than a Titan, while still being quite powerful.
Gigabyte, and EVGA both make great non reference GTX 780's as well, and if you can get them cheaper, that'd be the way to go.