If you haven't decided, I would go with the T-bolt.
1-Been out for awhile, alot of issues with phone have been worked out.
2-Plenty of support/developement out there for the device. Root it and the potential of the phone is awesome.
3-Being an older model, gonna be dirt cheap
4-Sure NEW (as in model) is nice, but gonna be less support just cuz so new and it WILL have issues.
My .02
HTH and good luck with whatever you decide