A lot recommendations here that would work. I support the suggestions for the Crawler and Irish Tour. The Crawler beefs up any strat and is capable of doing a lot styles. Also splits and cleans up great. Note that the bass is quite soft, compared to many other BKP's. Still tight enough for hardrock and perhaps some old school metal.
I would also look at the Holy Diver if the emphasis of your repertoire lies on rock, hardrock and metal. For the neck I would go VHII, if you want to retain some vintage(hot) character, but this pickup is capable of doing modern styles very well.