If your willing to spend 550, dont buy an origin8 complete. You can get a better bike. I own an origin8 del pasado built with many origin8 parts with a formula/deep v wheelset. Its super solid and rides nice. So I'm not just bashing the company.

as far as size, I'd say bigger is better. Check your inseam and compare to different companies 58 and 60 size geometry. If you can comfortably stand over it, go for the bigger one. Top tube length is key, but I would make the same recommendation. Bigger(longer) will be better in most cases.

Id take a trek soho s over the uno. There are also many online options. I'm sure somebody will say bikes direct so you might want to look there. Check ebay/craigslist/forums for used bikes, you could end up getting one hell of a bike for ~550.