When I bought my SM, the guy I got it from left it out in the rain. The shocks are rusty on the shaft inside the springs. I want to replace them.

I've been looking at the available shocks for this bike and I am concerned about lowering the shocks to 11.5 inches. I'm about 235 lbs (Thats about 107 Kilos to you blokes over yonder.) Do any of you folks think I'll have any problems lowering the shocks with respect to tires rubbing the fender because of my weight or on bumps or cornering?

Also, what is the general opinion on who makes the best shock for the money?