I've got GAS bad for a new head and the ones I want to try out are not carried at any local store. I'm looking at the GK fusion mb-800, the Peavey vb-2 , Markbass TTE-800 and the TC-electronic rh750. I'm using a Ampeg pf500 (I know) that has had zero problems with a tech 21 sans amp driver to fill out the sound. Looking at online demos is ok I guess but its not the same as playing with my bass. I have a local guitar center but they only carry the basic combos and a Ampeg svt that's been there a year and a couple markbass heads but not the one I want to try. a couple mom and pops That have mesa or peavey(but not a vb-2). Any advice from those who have played a couple of these. I don't want to order and return a couple times to get "that" tone I'm looking for.