I've been playing guitar for 13 odd years, and would consider myself fairly knowlegable when it comes to guitar amps. I only started playing bass about 6 months ago, initially to help out in a friends band when their bass player left with gigs booked! After playing half a dozen or so gigs, the position has become permanent and I need some decent amplification. I am the first to admit I know nothing about bass amps. I live in Carlisle and we are lucky enough to have Overwater based here. They have looked after and set up my guitars from day one. I tried an iamp 500 there and really liked it and the guys also advised me to have a look at the Mark Bass stuff, which I have and liked. Mark Bass is cheaper and easier to find second hand but I was concerned that if I tweak the volume on stage, will it affect the front of house because of the lack of DI control? Anyways, just after some friendly advice as to what you knowlegable people know about either amp and which you think is the best for the money. Cheers..... Mario.