Harness--
Murrays full race harness- it has two built in battens for lumbar support and clips to get in and out of easily. It doesn't bind the boys either.
http://www.murrays.com/archive/44-45.pdf
Shoes-
I'm in the market also.. Don't think the Shoe Goo will hold my old ones together much longer. Main thing is to get ones that lace up. The slip on ones will slip off while getting out on the wire. I have booties, but I like my shoes with neophrene socks in colder weather.
Foul weather gear-
I normally go with a farmer john wetsuit and Kayak splash jacket. I vary from rash shirts to poly pro turtlenecks underneth depending on the temp. I normally don't race in conditions lower than the 60s, so the wetsuit is comfortable.
However, this past Spring Fever regatta, conditions were in the 40 to low 50s and I borrowed a Dry Suit. It was the way do go in those extreme conditions. If you fork out $$ for a dry suit, get the integrated booties. It is well worth the extra money. I'm hoping to find one on sale and buy one this year.