Whatever you choice, feel it in the flesh - in a nutshell the best roller bearings you can buy. Machine mart is worth a visit, costco do a lovely roll cab in stainless now and then too. But don't buy blind. Try halfords, honestly. Sweet talk them into a "trade card" if you buy the industrial cabinets with the proper bearings, and watch the price slash... worth an ask.
http://www.halfords.com/webapp/wcs/s...egoryId_173018
http://www.halfords.com/webapp/wcs/s...7CPrice%7C%7C1