Re: passive pickup for single pickup guitar?
Metal. You know, that generic tone every Metal band has, which is why they all sound alike, even though Metal bands use almost every pickup, guitar, and amp on the market?
/sarcasm
Skip the pickup and the amp, get a 10-band EQ pedal and reshape your current tone with it. That'll hold you until you can upgrade to a bigger=better amp that gets closer to the tone you want.