I think it would be fun to ride Daytona at night and it's extremely lit. And just cause it's night doesn't mean it won't grip. Look at the Daytona 200 held at night in March in the 40's the last several years. Those guys are Pro's pushing it VERY hard. Hell, some were trailbraking into turn...
The HD GRO is what I recommend and it's worth it over the standard def any day not only because of the quality of picture but also because of the major wind reduction over the standard cam. GoPro has a TON of accessories as well at http://www.eyeofmine.com/gopro/order-gopro-hero.html#grabbag...
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Psycleskin undersuit. This is a great item to have to wear under your leathers. It keeps you cooler and it makes it much easier to get in/out of your suit. I wore it to two track days, washed it and it's been sitting in the closest ever since. Size XL.
$50 shipped
I actually found the manual to be a bit complicated. It explains what everything is but it doesn't do a good job of explaning how to save, move on to the next item, etc.
I found this much more helpful.
http://www.youtube.com/watch?v=BLWppamXWs8&feature=related