Since your wanting a nice sub I'll sell you my Critical Mass SS102 for $330 shipped...its in mint like new condition single 2 VC...It just like the one in this link
I have a 10' Kicker Solo X that I need to get rid of like yesterday but that might be WAY to much for your gf but let me know if your interest. 5000 watts. 52lbs. BEAST! I also have 2 10' Rockford Fosgates (punch) in a Bandpass box that hits really good. Was hooked up on a 600 watt amp was still really nice. Let me know!