I am not up to date on the iphone situation for verizon, but if you are looking for a new company, verizon is probably your best bet. I feel like they have the best variety of phones, especially with what you're looking for.
for you, they have phones like the blackberries,the droids, or the palm pre and palm pixie that have what you want. with these phones, you would have your monthly bill for whatever your plan is, plus a 30.00/month data plan. The phones vary in price too, but if you shop right, sometimes you can get them cheap.
if you don't want quite as high tech phones in regards to features, you could get the samsung rogue, env touch, or chocolate touch, or whatever the newest versions of these phones are (again, not up to date on my phones) you can still use the interet on these phones, just not as well as the smartphones, but the data plan is only 9.99 on top of the monthly bill. alot of the newer phones are touchscreen though, so i don't know if this would be a problem.
im not really sure the price range for the plans, but i know we have an unlimited messaging plan with like 700 shared minutes or something for 4 of us, and 3 of us require data plans, and i want to say our monthly bill is somewhere around $130, but i'm not positive. hope this helps :) if you have any questions i'd be happy to help!