MTX is pretty good, but I'm not sure which speakers you have. 8" isn't going to win any competitions, but it should sound nice in the cab, plus you won't be sending out a loud signal to any would-be thieves. You'll probably have to do some splicing or maybe an adapter from your stock stereo. I heard of people having trouble matching up after market w/ factory and decide to do a clean slate, so I recommend
http://www.crutchfield.com and see what they suggest. Hope this helps.