Very strongly considering going to an Android phone - I have two choices on the $29 plans (which is all I want to spend a month) - a Motorola Dext or a LG GW630.
Playing with them I prefer the LG, it has a much better spaced keyboard, typing on the Dext felt cramped. Also in the LG's favour is being on my current carrier - who are good value.
In the Dext's favour, not all that much, it takes the edge on some features and feels a bit nicer (I like the back).
I'm sold on the idea of an Android now, I've been cautious over touch screens, but my desire for a shiner and newer phone and the customisability of Android compared to my clunky old E63 and the fact they have keyboards have sold me.
I had been hanging out for one of the Windows Phone 7 devices or a Palm Pre, but neither seem headed here any time soon.