I'm not sure how many rims would hold up to hitting a pothole at 30mph but a good 36 spoke wheel from a good manufacturer is your best bet. I like Alex myself. Weinmann seems to make decent rims too, I weigh 220 and the stock 36 spoke weinmann rim on my MTB holds up to a pretty good pounding. Granted, MTB rims are wider than road bike rims so they can take more to begin with.