Yeah, the 4/3 is way too hot for me in the summer that is why I just use trunks if I go. I run hot also. But my kids surf a lot and they have (now) 3/2, 4/3, and winter suit. Plus we have vest/hood, just a hood, booties and gloves.
CR will have used wet suits but it's obviously a hit or miss. Actually, they'll have a couple of mine this weekend. :) They also have great deals on used boards. CR is a great shop.