Go with the xB!!!!
You have to test drive the xB. I have one and love it. There were a few simple problems with a squeek, but other than that, I have had no problems with it. I was able to find a TSB (technical service bulletin) online and was able to tighten the rear seat myslef to stop the squeek.
Since it is basically a Toyota in Scion's clothing, I expect to get several hundred thosand miles on it with little problem. I have a Toyota P/U with over 170,000 miles on it and I am just getting around to having to replace the clutch on it. You can't beat the Toyotas for their reliability.
As for the cost, xB's have a base of $14,100. That's with a manual transmission. They come standard with AC, power windows, power locks and power mirrors (options on most other cars)...
I am 6'2" and weigh 225. With me sitting in the driver's seat, there's plenty of room up front and in the back for an adult passenger (I don't even have to pull the seat up).
The looks of them----- you either love 'em or hate 'em. I haven't found too many people who don't have an opinion either way.
Performance-wise: they aren't too bad. Given the fact that they only have a 1.5 liter four. They aren't going to keep up with the Honda's and other things that have been recommended, but then again those others aren't getting the same milage and aren't as inexpensive....
PM me if you want a recommendation on dealership and salesperson.