I agree the GPU should be changed. If you want to stay with team Green, get an GTS 250 512MB GDDR3. I also second the PSU change, I don't trust HEC for power. Try Corsair, or Enermax, or PCP&C. Stick with P45+E8400+DDR3 if you can at this point. Stay with Nvidia if you plan to go Intel. Good Luck.
They aren't listed, are you reusing drives from an older computer or do you also need hard/optical drives? Dump the Hec, if you need more money get a cheaper CPU. The 9800GTX+ for $115 isn't a bad deal. Should be faster then the (stock) 4770, the 9800GTX+ was in response to the 4850.
DO NOT skimp on the PSU. Also note that the HEC PSU (and most PSUs in the market) advertise the PSUs "peak" power (the MAX power capable of being dilivered for a few seconds-minutes) and not continuous power (power that can be delivered for 24+ hrs continuously)like the Corsair/Antec/PC Power units.