If it costs $299 you could get two 750Ti's for that much coin.
It's not going to be more than 229$ but probably less than that. The problem with 750Ti's is that you still cant mine a lot of stuff and you so dependant on 2-3 developers. You will be missing all the good opportunities on new algos. It's almost funny to see how all those 750Ti owners are ass kissing Christian over there