Ok i'll try the GK heads at my shop after school see if they work with ashdown
let your ears be your guide, do try Mesa and EBS if you can. Try as many different brands as you can.
Ampeg, Markbass and Eden are kind of the opposite end of the spectrum from GK in terms of in your face mid range. You can get it, but have to work for it since that's not really their "baked-in" house sound. Great amps, just a matter of what you're looking for.
NB: take your time, listen, compare, and enjoy the process, you'll learn a lot