Whatever you do, don't pay full price! Shop around online and find a great deal on rain gear. I bought my rain jacket and pants at www.sierratradingpost.com. My jacket is GoLite and my pants are Helly Hansen. Bought both for under $90. My jacket has NEVER let me down in the rain and I've put it to the test more than a few times.

I hear great things about Frogg Toggs as well... Good luck!