a good rain suit is a terrible thing to leave at home...lol
I have a few different ones.
my sport touring rain suit is made by tour master and cost around $100 if I remember right. my 2nd one is the frogg toggs, cost about $40 and can be had at some sporting good stores, a lot of (duck) hunters buy them.
I also have a few sport touring jackets that are water proof.
on my other bike only the tips of my boots get wet as long as I am moving due to all the body fairing, electric windshield, etc.
AND...last....what ever I am wearing at the time is my rain suit.
BUT, be careful of the hot muffler melting your rain pants all over it....and yes rain hurts at high speeds. as a kid I rode a lot with out a shirt, and have even ridden over 100 mph in the rain years ago.
as far as handling, pay attention to hazards, such as ponding water, ruts, unknown depth of pot holes, leaves and debris, leave more of a following distance, don't brake or turn too hard or fast, just hazard awareness and common sense can go along ways...always pay attention.
now...go out there and get wet and have some fun...lol !