I dont' do tri's, I might do an sprint tri this year with a friend but I"m just not a real strong swimmer. I put about 2k on my bike last summer, not a ton, but fairly respectable.
The seat is made by specialized, it's their top end......Toupe. It's a piece of Carbon, Titanium rails and a piece of clothe over it, i think there are some very thin gel pads under the cloth.
The Zertz make a surprising difference, my hands get almost no vibration, I have ridden a Tarmac, which is a bike geared more toward racing, it has a slightly different frame with no Zertz and roads feels a lot rougher.
PSM, I actually ride with a Cateye Triple and Double shot, I had an HID for a while but the bulbs are kinda fragile. I replaced all the LEDs in my double and triple with UWOJs and it puts out a lot of light with a 3+ hour runtime, works great.