I have a B&K 125.7 (125W x 7) that I also like. It's about 5.5" high on feet or ~3U if you were to rack it and has both balanced & unbalanced inputs. They also make a 200 watt version that their website shows at the same height but the picture looks taller so I question that dimension.
I use an Anthem pre/pro with mine and considered their amps too so I would checkout Vmk's recommendation as well - however their balanced amps are more expensive and taller.
I use an Anthem pre/pro with mine and considered their amps too so I would checkout Vmk's recommendation as well - however their balanced amps are more expensive and taller.