Just saw your thread over on I-club, figured I'd post here about it
Congrats on the car! Thats definatly one of the cleanest subaru-914 swaps around!
For tuners around San Jose, i'd definatly go to Gruppe-S or hook up with EQ Tuning on I-club. They have great reputations in the Subaru community and know a thing or two about working with Subaru ECU's
$20k does seem a tad pricey to me, but if it includes alot of the custom work you mentioned like the suspension, seats, etc. it can add up. There are cheaper options if you wanted to do a 200hp+ Subaru swap in a 914, and some shops that could work with the wiring too (Getting that motor to run in a 914 without smog requirements is probably easier than swapping to different body style subaru and keeping it smog legal, which is what alot of the subaru shops work on) but you still need some of the physical parts like the motor mounts, radiator setup, etc. that will add up.
Anyway, congrats on the car and enjoy it...
Whatever you do, YOU CAN NOT WRECK IT!
Its too awesome!