I ran my '91 with no top whatsoever for about 5 months, and yes, I got plenty wet. The only problem I had was with my Sony CD player. I also replaced the nasty carpet with truck bed liner.
My solution to the radio problem, if I ever got around to it, was a marine unit. They're waterproof, and more shock resistant than typical car stereos. Unfortunately they are also largely white, which looks a bit dumb... Check out <a href="http://www.boatus.com/." target="_blank">http://www.boatus.com/.</a>
Oh, and speakers... make sure not to get paper cones. they will last about a week in the water and sun.
GM SM465 trans
GM NP241 transfer case
4.10 jeep axles
33x12.50 SuperSwampre TSLs
4.5 inch Rubecon Suspension lift