Chip, it's not that easy. There really aren't very many decent Forged pistons on the market for the CVH.
The ones in my engine and the engine that we are selling were made by Ross Racing and were spec'd in full. OK, so they were loosely based on a standard piston, but only in so much as to get the approximate sizes, then the desired compression height and so on was decided from there.
That's a custom piston in my eyes and is pretty much what he is after.
That said, £2k for a complete bottom-end, built is a bargain IMO.
The pistons will cost around £600+, the rods were £700, that's £1300 already.