The speakers you see in clubs - the ones that produce a HUGE amount of noise and bass. Can someone link me or provide advice?
JBL are ok, but they are overpriced IMO... Bose also charge thru the nose.
For maximum bass look for horns, brands to look for are Funktion 1 and Martin Audio. Danley are the cutting edge right now, giving the most output for a limited enclosure size:
Get a few of these for bass, but make sure you're house has thick walls.
http://www.danleysoundlabs.com/DANLEY_dts20.htm
These are nice tops:
http://www.danleysoundlabs.com/DANLEY_sh50.htm
Also, you'll need some decent amps, you can't go wrong with QSC or Crown really.
If you need any advice such as crossover settings, fire away.
Also, this gear may seem expensive, but you can make your money back easily by renting it out, so it can be a good investment. I'm currently building 4 tapped horns similar to the DTS20, and I plan to rent or do the mobile DJ thing once I get a good enough soundsystem.
EDIT: What size room will you be using these in? Bigger rooms need more cabs, and if you are planning to use these outside, you will need lots more cabs....
EDIT2: If those DTS20's don't have enough bass for you, ask Danley to build you a matterhorn:
www.youtube.com/watch?v=o36Kp6veJ6c 