I can personally vouch for the RTI remotes. I have had a T2C for about 6 months now and absolutely love it
I work for a company in Perth Australia that is a RTI dealer and the retail is $3905 AUS. You then will need to have your dealer program the remote for you as the software "Theatre touch designer" is only available to dealers so there would be an extra charge for that... Do you really need the T4? You should have a look at the new T3-V that is out. Not too sure what the price is though but if you need to know i'll find out for ya.. RTI also has the possibility to control RS232 Devices ie. Lighting control, A/C etc and transmit over RF..