2. You need EQ, so be prepared - some sort of DSP maybe

3. A high Q is a substitute for too little amp power/control - bi-amp

4. Read about Olsher's Basszilla - I've built four versions and the only drawback is too little Xmax on most mid drivers for "movie" levels. (http://store.hifiauthority.com/olsherkits.html). His crossovers or value priced DSP, like Behringer? No contest.

5. Pretty good reading at NaO (http://www.musicanddesign.com/naomain.html)