Always think "cross-promotion". Your builder may have suppliers, or contractors, who may also get involved. They can split their costs, and have more to spend on you.
Example- Joes Machining & Blows Pistons $500.00
or
Joes Machining $500.00
Joe can get Blow to pay half,or you can double your money.
Good luck Scott
(by the way, it would help if you were better looking too:D)