Trackball mouse recommendations?

[ILL34GL3]

I'm thinking about getting a trackball to mouse with. Anyone have any recommendations? This looks like the most comfortable model to me, but hell I don't know. That's why I'm asking:
http://img295.imageshack.us/img295/8731/trckbll12nw.jpg (http://imageshack.us)
Here's another, doesn't look as comfy:
http://img295.imageshack.us/img295/8953/trckbll26rm.jpg (http://imageshack.us)

[awr000]

If that top one is the microsoft trackball (don't remember the model exactly) I have one and it blows badly compared to the cheap logitech trackball. The ball on the microsoft version (at least mine) doesn't spin very well.

[Eratosthenes]

I use a trackball to save my wrist for future use (i.e., avoid RSI). I use the logitech model (Trackman wheel) that looks similar to the top picture in your post. I'm very happy with that trackball. I have used the one in the lower picture and I think it is worse for RSI than a regular mouse.

[awr000]

Was rushed earlier, here is a link to the one I use..I think it is the same as the Erasthonese...

Logitech Trackman (http://www.logitech.com/index.cfm/products/details/US/EN,CRID=2150,CONTENTID=5002)

I have just ordered the Trust Wireless Hand Track Laser. It's wireless so no need to have your hands on your desk anymore.

http://www.trust.com/products/product.aspx?artnr=12779

[danzasmack]

i got the cheap logitech one and have sold many others on it.

it rocks.

[IHateKeithSmart]

Yep, just made a similar post in another thread. You really can't go wrong with the trackman, and it's inexpensive.