I've got all the drivers picked out for my system:

Tweeters: Audax 3/4" shielded Titanium Dome #TM020J7
Mids: Audax 5.25" Shielded Aerogel Midrange #AP130ZO
Woofers: 12" Dayton Shielded DVC Subwoofer #295490
(all on sale from partsexpress.com )

My center will be two mids and a tweeter, the two fronts a tweeter, a mid, and a woofer, and the two rears a tweeter and a mid. I hope that the two 12's will suffice for low-end until I can afford to put in a real sub.

Now my question is, where do I go to find crossover plans and parts? I've heard that madisound can do them, are there any others? And how much can I expect the rest of the materials run me?