I've got two different Roadstar II models that I've siwtched to Bare Knuckles - one has a single Holydiver in the bridge, the other has a Black Dog bridge and Mississipi Queen neck. Both can get the sounds that you're looking for: the Black Dog is rawer, growlier; the Holydiver is smoother, fatter and higher output. Both sound great clean and get good split coil sounds too.
The Black Dog/Mississipi Queen combination works really well - good match in output and tone if you like a smooth, fat neck sound with a rawer, more agressive bridge sound. Never tried the Black Dog neck, so can't comment on that.
I've got a Hoydiver set in another guitar of mine - that's a really versatile combination cause both the pickups split really well, but the humbuckers are definitely fatter/more compressed than raw and crunchy. The bridge Hoydiver does sound fantastic in the Roadstar though!
The other set I'd think about are the Crawlers - they're sort of half way between the Black Dog and Holydiver in terms of output and tone: fatter and a bit more oomph than the Black Dog, less compressed and more raw/agressive than the Holydiver. Split great too! Don't have them in a Roadstar, so I don't know how they would sound in a basswood body.
