I'll never buy another brand of subwoofer. I'm regretting my SD amp purchase right now. I should have waited on the DC 5ks. As soon as I have the money, I'm gonna pick one up. DCFTW.
I understand you are on a budget... I'm looking for the exact same alternator. But you will get what you pay for. I can get a 240 amp alternator locally for 275 bucks...but it wont put out anything at idle. If I were you, I would save for something good. I'm saving for a mechman. Lots of idle output, and they are built to be beat on daily.