If I were you today, I'd be calling Sam Shalala at Pro Teckniks.
http://www.protechnik.com/
Sam does all sorts of engine swaps and has a fabrication shop as well. This man is well respected in the local PCA group and he installed and dyno'd my boxster when I had Che's muffler and headers installed.
I would not be surprised if he could also get you a rebuilt 3.4 at an attractive price... however, if I were you (once again) I'd buy the tranny, engine, ECU and wiring harness and have it shipped directly to him to install. Then you don't have to pay another markup on the parts.
PartsHeaven, LA Dismantlers, and Oklahoma Foriegn would all be good sources for these items.
Also, do a thread search here because this engine swap has been talked about over and over and over (which never bothered me because I'm so interested in doing it).
Lastly, I would search out the users on this forum who have done it and ask them three things:
1) Who did their swap if they didn't do it themselves? For an extra $800, you can ship your car to wherever and then drive it home.
2) Complete parts list.
3) What they paid and if it was truly worth it.