There will be no bottlenceck whatsoever. The 1090t has pretty damn good per core prformance. I think it lies just above the fx6300. so there shouldn't be any bottlenecks.
You can get a sapphire Vapor-x 7970 for less than a good 770. It's the same card I have and I play every game maxed out, Grid 2, Witcher2, Bioshock Infinite, Sleeping Dogs, a good amount of others, all without issues and almost always above 60 FPS. Check out the benches for it, too, against the 770. with some overclocking you can get a bit better performance than a 770 and for a bit cheaper.
Of course the 770 is a great card, but certainly consider the 7970.