1. Did you try a hard reset? Some people have reported it that this speeds things up for them.
2. Try turning off T9 (if you have it on) and see if that speeds up your typing.
I can't imagine how the 800w or 700wx for that matter would be faster than the Touch Pro when the Touch Pro has more RAM and a faster processor... Perhaps the stock ROM on the Touch Pro is fairly loaded, but I'd stick it out as I'm sure custom ROMs will unleash the true potential of this device