Car audio setup help?

Car: 2003 Mercedes-Benz CLK 500 (Bose system) (please no Bose system s*** talk; I listen to Hip-Hop and I prefer Sound QUALITY and it definitely sounds great to me.)

Sub: Possibly a Kicker L7 Solo-Baric 15"
Other suggestions welcome. I’d prefer ONE sub at 2-ohms, 1000 watt RMS.

Amp: Looking at an Alpine MRP-M1000.
Again, other suggestions welcome.

I’d like a sub to hit, but have more accuracy and good sound quality. I don’t want to sound like rolling thunder on wheels.

Budget: 0
I would prefer to buy the sub and amp off of eBay stores for a reduced price, but the downside to that is no warranty.