The 290 would be its counterpart. And one step higher up we have the 290X vs the 780ti. And that depends on what you want to do with it.
Assuming just gaming (@ 1080p), I would pick the cheaper of the two. I think both perform pretty much identical. But the 290 is about 30-40 euro's cheaper, or that is where I live at least
If you play on resolutions higher than 1080p, I would probably go for the 290. Altho the 780 as enough vram to do that as well. If you are interested in streaming or recording, the 780 is probably a better choice due to shadowplay