the vk-75se is a much better amp than either ARC, imho. it should be since it costs at least $2k-$3k more. not to mention the fact that the ARC is less user friendly (no auto-bias) and more expensive to retube (more tubes!).
if you have the cash, get the BAT. BAT stuff rules.
if you have the cash, get the BAT. BAT stuff rules.