Body and neck, fretboard is rosewood.
Tim and Nick from Axepalace.com both recommended the Ceramic Black Hawk to me for my
basswood Ibanez RG tuned to B standard. A Mahogany neck and body guitar with a warm, bassy humbucker can turn into mud.
Check out the rating of the capacitor on the tone knob (if there is one). If you've got .022uf, switch them to .047uf's. If you've already got .047uf caps, the next step is .001uf caps.
I found changing caps to be much more effective for curing an inherently muddy guitar than the whole 250k/500k/1meg potentiometer thing.