I would not source it out: http://woodastic.blogspot.com/ I would also prefer to buy a finished boat if I had the budget <img src="http://www.catsailor.com/forums/images/graemlins/smile.gif" alt="" />

But then, if I were to source it out and had a good budget, I would get:
Hulls and foils from formulacatamarans.com. I like these the best and know Marcus. Might have to order a set of T-foils from Darryl as well just to compare, as long as we are dreaming up boats.
Mast, preferably a carbon wingmast. Less weight is always good.
Beams from the dies Wouter and Phill did. I have only heard secondhand rumours and hints about this, but knowing both of them it would be good stuff.
Fittings from Riley, to test them out and see what they are like.
Sails from formulatamatarans.com, becouse Marcus is active in the class and optimizes his shapes for the boat instead of scaling down e.g. Tornado or F-18 spis.


Now, in the real world it is homebuildt hulls, cut down Tornado masts, alu-tubes for beams, homebuildt working sails and tramps and possibly homebuildt foils as well. Cheapest workable fittings (probably Riley, dont want to go too cheap and buy junk). All to save some money both in the short and the long run.