I was long time user of Opera then jumped ship to bolt, Bolt is quicker then opera last I checked. haven't used it on my 9650 however, the BB Browser in 5.0 is pretty good.
Also I would not trust any browser going through a proxy with any banking confidential information.. Just because.
8830 -> 8330 -> 9550 -> 9650
Just think about how far BlackBerries have come from then till now... And what else is coming.
Follow me on Twitter