6800 vs Touch Pro vs Touch Diamond?

[jpc0480]

I have a 6800 with Alltel and have gone through about 7 of them through refurbs or in store replacements. Recently on my 6800 I got a white spot and was going to have them send me a new phone.

What I want to know is if I can get them to give me a different phone which way should I go?

The 6800's ram sucks, and I'm tired of only being able to have 1 program running at a time without bogging down my system..

Which is the best way to go here? Touch Pro or the Diamond? I see they both have the qwerty keyboard. But what are some of the drawbacks of the two?