I would highly suggest checking out a Carvin Legacy cab, I own the 2x12 and love it to death, plus its fairly cheap (you can get a 4x12 on ebay for under $400) I would have gotten the 4x12 but I just cant lug it around with my bad back.
But then again, it really depends on your playing style, the legacy lacks a little on the bottom end, but makes up for it with screaming mids and highs (If you know how Steve Vai plays, then you would understand the bit of lack in the low end.)