Nick,
You can't go wrong with an Ashdown.
A few years back, I had an ABM rig. That was the time I was essentially playing rock. That was a fabulous amp. The reasons why I let it go were that 1/ I wanted to downsize my rig due to my asthma problems, and 2/ I was playing less and less rock.
Now I have an Ashdown MAG300 rig (w/MAG-210 cab). Basically the same thing as the ABM, but without the touch of "drive", and minus two bands on the EQ. And the MAG is way less expensive. My complete rig cost me less than 700 EUR, new.
Finally, I wish to specify that in the past I had several high end amps (SVT's, Sunn, etc.), and I believe I'm able to say if a bass amp is of good quality or not.
Believe, the MAG series kills.
If you want some "drive" but can't afford an ABM, you might consider a MAG + an SABDDI, for instance.
Cheers,
JL