I haven't seen a used one of those on ebay or craigslist in ages. Let me know if you're selling either of those!
look at guitar centers used site, there's a few used 5150 III's listed.
whats the difference between the 5150 III and the 5150 III HD? There are both on their used site, but a $200 price difference.
Cobra sounds like a blend between a Rectifier and a 5150... there's really no reason to own one either. You have your bases covered.
All high gain amps with 6L6s and five gain stages start sounding the same after a while. I feel like the 5150 III CAN do a lot the 5150 can't, despite it sounding the same in that test. It's a big part the player, but you'll find an amp that jives with someone better and it just clicks.
Went through three cobras. Reliability issues to boot. Jus sayin.