I saw on a thread here about an alternative to the BodyBugg called the BodyMedia Fit. This looks interesting enough to make me want to try it.

Does anyone know....if I buy the basic model, can I add on things later like a digital display? I'd like to get started with it to see if it suits me before I spend too much $$ on it.

Thanks for any thoughts on the matter.

Yes, you can.

I just received mine yesterday. I got the armband with display. I was thinking of doing like you suggested, but then I saw that there is a money back guarantee for something like 30 days so I decided to get both, plus the year subscription so each month is cheaper. I was taking advantage of a great sale, too (not sure if there still is one, though).