Big fan of the 'stitch, buuuuut as you said, pricy. However, I have seen slightly used ones being sold on the ADVrider forum for reasonable price.
I purchased an Olympia Phantom about 6 years ago for 350.00 new (had a special 30% discount card from BMW/Louisville). It has held up very well. Only problem it has had is with one arm vent zipper going bad. I had that fixed for $20.00. It takes me a minute longer than a 'stitch to get in and out of, but so what? I recently purchased a MESH 1-piece Olympia to compliment it, bought off ADVrider as a used unit. Owner said he had used it 5 times, and it looks like it.
Fitting on a 1-piece can be tricky, especially if you are looking for a perfect fit. Some people can wear one right off the rack with no problem, some can't. Aerostitch offers custom tailoring that others do not. 2-piece units can sometimes make fitting easier.
Now.....would I get another 1-piece, or would I go with a 2-piece in the future? I think I would go with the 2-piece, in all honesty. A little more flexible IMO, especially when you get to a stop and don't want to drag the suit around with you. However, for commuting to work, the 1-piece works very well.