Gareth,
Of course the "right" amp for you is very subjective. I have never wanted to buy any of the micro amps until I learned about the RH 450. Most of them are super hi-fi, super clinical and pristine sounding. I need something with some balls!
I can recommend that you seriously consider the RH, as it has a warmer, grindier tone than any Genz Benz. If you are a rocker and used to tube amps, I think you will like the RH (only weighs about 50lbs less than your orange!, love the Orange BTW)
THanks! I think I will really like it. Will keep you all posted!