The TF270 heads are the easiest and cheapest way to build if you're shooting for 700 to 750 hp. Especially if you go with the new Trick Flow 4500 intake.
The Indy EZ and SR head will also make that power but they cost a little bit more and require a little bit more work. If you're shooting for 800+ hp then best to start with a bigger head. I think the TF270 heads will make 800, but it would be a lot easier to just start with a 440-1 head if 800+ is your goal.