The keypad on the 7100 is very usable after the first day. It was driving me nuts at first but that night I was doing some email and realized I wasn't even thinking about it anymore.
I'm also using a 7290 though I just got it today. I think I like the speakerphone option on the 7100 and will miss it, but the bluetooth handsfree is working great.
I will say that the 7100 will require recharging every day. It is hard to see outside. I don't go outside that much, or if I am it isn't to read email.
If you're happy with what you have, why not stick it out for a while and see what else comes along? The only thing you'd be gaining is a brighter display and Bluetooth - and if you haven't used Bluetooth before, you don't know any better and wont miss it!
I couldn't use a blackberry full time unless it had bluetooth; but I've been using Bluetooth for a few years and am totally spoiled now.