Does anyone reccommend a wireless company for my PPC? Which one do you say is fastest? Which one cheapest?

Also, I am unsure which plan to purchase. I don't really understand MB download. I know I will be most likely using it daily but I don't download things very often. If I simply use the internet does that count as downloads? Is there a little thing on the ppc that tells me how much I've downloaded so far? Help.