Hi,
* something that shows up at night
- Somebody makes a little light designed to do this. A light in the computer will drain the battery too fast
* waterproof of course
There are degrees of waterproof-ness. Few have problems with rain.
* on-board bell or horn
-battery drain, if anybody did such a thing I don't think anyone does
* accurate
- accuracy depends more on a good wheel measurement than anything else. These are computer chips, and the math is simple.
* reports rear cassette gear
-this will limit your choices. Personally, I don't see the point
I don't need a heart monitor attachment but GPS would be nice!
- Start looking at GPS websites, and see if you can't find guys who have them on their bikes.
-- I have a Planet Bike speedo. It's cheap, especially if you get an older version. It shows a ton of info on the screen at all times.
Best of all, it turns itself on. Having 'lost' a bunch of miles from forgetting to turn the computer on; I refuse to buy a computer that doesn't turn itself on. I don't want to fiddle with it in traffic; so having the pertinent info on the screen at all times is a real plus.
http://www.performancebike.com/shop/...tegory_ID=4110