Mahogany body, mahogany neck, rosewood fingerboard ... sounds good ... but Mud City?
If the guitar has a maple cap does that change your thoughts on Mud City?
yes. most definately yes.
mahogany body, mahogany neck and rosewood fingerboard - that's an SG and the last thing I'd call them is muddy.
sg's i've found to be very lightweight and open sounding, they're using the right mahogany -- lightweight quality stuff, and also, the pickups work well with them
however, if you're using mahogany and rosewood (both very warm and somewhat dark woods), and have dark pickups (like a SD invader) and like to use lots of gain, an all mahogany guitar is a mud factory. Just gotta watch your electronics and pickups with your woods, because some woods are easier to muddy up than others. This is why i like maple caps and ebony fretboards to brighten the tones up :)
anyways, 500k's cut way better than 300's. Definately a great pair with a mahogany and rosewood guitar.