If you like the Aerons, you may also want to check out the chair I mentioned, a Eurotech iOO or an Ergohuman, but you can't find them in stores. The closest thing you can get to it is if you find a Staples store that has Raynor chairs or an office supply depot that just happened to have some.
Besides the mesh being hard on your skin, the thing that led me to sell my Aeron was how hard and unforgiving the seat frame was. You don't always hit the mesh parts when you're sitting and sitting against blast proof plastic gets irritating.
If you're in the South Bay, drop by Tom's Discount Office Furniture in Santa Clara. They often have overstock items and sometimes will have fully loaded Aerons for a lot less than retail. Last time I was there, they had HM Mirra 1's for around $400. That's another alternative if you like the Aeron.
I tend to favor mesh chairs and ones with minimal padding because padding always wears out and becomes a very different chair once it does. If I need more padding, I add my own.
Leap's are nice chairs. I've never owned one of those, but it was one of the ones I did a long sit test in. They're just basically a super solid uber adjustable industrial strength office chair.
Thanks. I will check out Tom's