I recently made the transition to a suit, and haven't been uncomfortable-enough to hang it back up.
I picked up a LICO suit on the cheap, and it works. I'm sure there are lighter-weight suits on offer. It definitely gets a little toasty this time of year, but honestly, I only notice this when I'm standing around getting into and out of the car. Once I'm driving (i.e. when it matters), it doesn't bother me any more than jeans and a long cotton shirt would.
If you can afford one, no one is going to tell you that it isn't a good idea. I've had to jump out of one too many burning cars to say otherwise :biggrin: