personally i hate the look of mark bass stuff and i hate their prices too. i've never even considered playing one of them. people say they sound good but i don't care. they're friggin' ugly! haha
then again i play and listen to rock music. i've never seen a rock band where the bass player used mark bass equipment. maybe there is one out there i dunno.
i'd say go for the GK cab all the way!
fender american standard jazz bass (blizzard pearl), Gallien-Krueger MB115-II, GK Club #1000, Fender Jazz Bass Club #1199