You didn't say whether or not you want a built in laptop compartment. You might consider that in your search. Most of the above mentioned mfgrs make such a bag. FWIW I have the Timbuk2 with one and I really like it the dedicated laptop pocket.
Not sure I would get the Timbuk2 again. It's great quality but the handle ends up digging into my back and it's not exactly shaped to fit your back very well. Oh but once I had a large full bottle of water explode in there once and the outside remained dry...so I know it's waterproof at least from the inside!