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
It would be great to see more dev's for nvidia. My 750's have ran cooler, less power, cost less and more reliably than my AMD cards.