My 7 cents: Spend the money on the bottom end. Spec the cam for the head you are eventually going to run. Do a minimal refurb on the stock head. Buy the good-flowing head later when budget allows. A big power head on a sketchy bottom end is no good when a connecting rod is stuck through it. A rock solid 250 short block built right will last forever.

"The first rule of overkill: You can never have too much overkill."
"Overkill is underrated."