I cannot comment on URC as ive never used any of them. however.

All Pronto models have the ability to communicate via existing wireless "G" networks aswell as stand alone RF or direct IR, some RTI models also do this but not all have wireless 802.11g (the t3-v you listed i believe does) the rest use a form of zigbee which is a low cost alternative medium of wireless. some of the RTI panels have a built in web browser where as the Pronto family at current does not.

Personally i believe greater value is to be had from the Pronto (though i would guess this is hardly suprising as you are in the Pronto forum) as it can utilise your existing wireless infrastructure if you already have one. The aesthetics are also less bulky.

The Best Suggestion I can offer you is to go to the Philips Pronto site and register then download the software and play around with it. there is a simulator included for testing out your configurations.