Razlaw,
Might I recommend you hold off for a few months? For what you're looking for, Lutron's Homeworks QS will probably be your best option. Finally they're going to include T-stat control which means you can do it through their pre-packaged interface.
Prior to this, if you wanted t-stat control the best option (imho) was to combine a Lutron system & Crestron components. This was pricey and introduced not only a bit of redundancy with the Crestron controls, but tremendous cost and the need to program another system.
I don't know if you've seen the Homeworks iPhone app, but it's pretty good and will ultimately adapt to the new features of the next generation.
If you need help designing, feel free to PM me and we can get in contact.
There is scarcely anything in this world that some man cannot make a little worse and sell a little more cheaply. The person who buys on price alone is this man's lawful prey. - John Ruskin