Will this be a "track only" car or is it going to be like a "race inspired" street car. If the latter is true, I would build your motor, throw some forged internals in it and boost it.
Have your looked up the price for a billet crankshaft? Unless you're a trust fund baby, I wouldn't think you would want to spend that money on a crankshaft.
FR '11 FF Mod pick
FR '12 Carlisle Nifty Fifty Award/Best in Boost/Best 08-11/Finest 5 Pick
FR '13 Carlisle 1st Place Award 08-11 Focus/1st place 08-11 Focus (FR13 award)/FSWerks pick/Ford Racing pick/Finest 5 pick/Top pick in the finest 5