First of all... Merry Christmas!!! I've an Aguilar 410BD cab (700w/4Ohm) that I usually pair with the MarkBass head of my CMD121 combo (alone, of course) when I need more volume with my country-rock band. I have a Fdeck's Series II and a Fishman ProEQ Platinum too. Good ply doublebass with gut strings and an Underwood pickup. I want to try another head for the 410 but I don't know which one will be better for my pourpose: Aguilar AG500 SC or GK 1001RB (too hard to find an old 800RB were I live!). I can't try these amps so I want your opinion!