Best of the four? The best two are the 8130 and the 8830. They are different form factors, you will need to decide between them yourself. The 8703 is great too, very sturdy.
For your questions:
--Lots of applications available. I don't know what WM has. Search the Aftermarket Software section here for the apps like you need, and ask back afterwards if you don't find something specific you need.
--Yes, on VZ.