I guess my first was for playing music from my computer and for playing back my recorded guitar licks:

M-Audio Firewire 400 Interface
Behringer TRUTH B2030A Monitors (pair)

Could really crank those suckers. Of course, it was all playing back 16-bit digital music from iTunes... not quite testing them to their capacity.

Then I got into vinyl after finding 200 old records in my parents' basement. I've been sitting on this setup ever since (~3 years):

Audio Technica AT-PL120 Turntable
Pioneer SX218 Receiver

I have dreams to go big, though...