woofer enclosures

[Becks]

Ok. I have the money to totally upgrade my system. I think im gonna go with 2 12'' or 10'' infinity subs. But what i want to know is if there is any advantage of sealed boxes over bandpass. Some of my friends have the dual 12'' bandpass box with plexiglass in front and the subs face eachother. I just want to know whether to go with sealed or bandpass.<P>I also need to know a powerful amp that will make these subs sound good.