Thanks for chiming in Alex, I will be gigging with the TH500 until I pay off the BTII. I am looking for a backup or a main amp different from the TH500. It is not that I don't like what the TH does but I want to have a choice. I am also considering the new Aguilar AG700 which will be out before I am done paying off the BTII.If you already own an amp I always recommend sticking with that amp with your new Barefaced cab(s), until you get to know the cab(s). Once you have experience of loud rehearsals or gigs with your TH500 and Big Twin 2, then it'll be far easier to accurately advise you on the best choice of amp. It may be that you don't need to change the amp at all!
Thanks again Alex.