I had my first build done by Entreprise, and I'm planning on building a 2nd kit myself. For the first, I bought a really nice kit from Gun Parts Guy, and bought an Imbel Gearl Logo receiver on Gunbroker. The kit and receiver were too nice to mess up, so I decided to go with Entreprise (they are near where I work, and did the x-fer of the receiver for me).
Really a quality job. I paid extra for a trigger job, and everything came out real nice. I now have another kit on the way, and I'm going to use a Entreprise receiver. I'll let you know how that turns out! Here's a few pics1