Well, now that an expert has spoken...
Texxo - first pick the carrier; sounds like you have done that.
Decide which keyboard form factor (suretype/share keys or dedicated keyboard). Some people simply don't like the Suretype keyboard - I don't.
If possible, go to a store and check them out.
8120 - Suretype keyboard
8220 - Suretype flip phone
8520 - consumer grade, full keyboard. No GPS. And TT doesn't like it
8900 - not exactly burly, but a solid device
Good luck choosing.