Regarding riding often...
On the spec I was sent over from PX I have just requested the 60mm carbon clinchers rather than the 100/82mm tubs... just because I will be riding on those most of the time as well as I don't really want to have £400 worth of wheel that are used 4 times per year in racing!!
If I was racing more often (i.e. if I had a car to be able to get to races) then I would think about going for the deeper tubs and getting some cheaper wheels to train on but it's probably not worth it for now
If you get the Stealth with Rival and 30mm wheels its about £500 cheaper....
EDIT: GB - any news on those wheels. Bike Science in Brizzle are out, and I really want a pair.
I asked to change from the tubs to the clinchers and they said that was fine, but that was the 52mm... will check when i put the order in tonight that 60mm are ok, so I am assuming they have them in stock. That's coming from the showroom at Rotherham