Tito, how come you decided not to go with the W7's?
Sonik- The 10's are going to hit a little quicker, so if you listen to music with a lot of quick beats ( metal, some techno) the 10's would be better off. If you go with 2 10's the enclosure and such is going to weigh more than it would if you put a single 12 in. The 12 is going to go deeper, so if you like alot of deep bass, go with the 12. But remember, you can buy the most expensive stuff, but if you dont have a good solid install, its not going to perform up to your expectations.
On the amp, i think the bd1500 is going to be a lil bit overkill for a daily driving sub(if you're going with the 12) but would suit the 10's well. Look at Cadence ( Z7000, Z777, A5hc+, and A7hc+) Orion ( 250g4, 275g4, 800.2, 1400.2) Zapco ( 9.0 ) or a DEI 1100D
Hope this gives you some help on what you're asking.