If you want to stay under a $100, those will be great bindings. I bought those from the same guy you're looking at off ebay for my girlfriend and she loves them so far. I thought they were pretty comfortable, but didn't have the ankle support that by Transits have. If you can spend the extra money, upgrade to a pair of transits. Otherwise you should be real happy with the ultras.
The one other nice thing about the ultras is you can rearrange the overlay orientation to make them a little easier to get in and out of while still being real comfortable.