I've played through Ashdown gear for 20 years as it always seemed to have a level for my budget at the time, starting out with the EB180 combo (which I still have). I would say that there are limitations in some of the single speaker cabs when used alone, so my preferred setup is a 12" and a 15" cabinet even for smaller venues, the current ones are the whiteline Rootmaster cabs. I have a 300w Original head and never found it lacking in power. All in would be less than £1000.
The best thing about it is the portable nature of all of the kit, the cabs are less than 15kg and the amp is tiny, so finding your way from - to the car park and past the drunken hoards is no issue. I've had the larger MAG cabs and they are heavy as hell, not something that is an issue if you can park and load in at the stage, but that's not the reality for the majority of small venues. Your back will thank you for lighter gear. Playing for 3 hrs and then packing up with a 30-40kg cab is no fun after midnight!
As for the Original head, I play a broad range of stuff from punk, through indie, pop and dance music and not found it lacking at all. The EQ is simple and can be dialled accordingly. I've played back rooms in pubs with the 12" cab only, through to large outdoor marquees with both cabs with no PA assistance on the bass and not had any issues with the sound. Anything bigger gig wise and you'd likely need to be plugged into the PA anyway.