I'd get a TX750 or maybe even a TX850, they're not much more expensive.
Look up prices on Newegg too and if you're within driving distance to a MicroCenter I'd get the i7 there as I've heard they're selling for around U$200.
Look up prices on Newegg too and if you're within driving distance to a MicroCenter I'd get the i7 there as I've heard they're selling for around U$200.