#2
What kind of guitar do you have now?

What bands constitute your definition of grunge?

Budget?
Warmoth Strat w/ Lace Holy Grails
'07 Roadhouse Strat
Washburn WD-21 all Koa Acoustic
Marshall JCM-2000 TSL-122
Bugera V-5
#4
If I'm not mistaken, Kurt Cobain used DiMarzio Super Distortions on his Mustang, Jerry Cantrell of AIC uses a Duncan JB IIRC as well. That should least give you something to start working on.
Gear:
1987 Charvel Model II
2010 Carvin ST300C
1990 Charvette 100
1991 Ibanez RG560M
2006 Fender Mexi Strat
Jackson/Charvel Star W/ Custom Graphics.
Ovation CP 247 Acoustic
Line 6 POD HD Pro X
Pro Tools 9

Tutorial: Studio Quality Programmed Drum Sounds