I'm not sure what speakers you use, but here's another suggestion. A while back I went from an Acurus A250 to an Aragon 8008BB. The first thing I noticed was more "bass slam." Based on that, I think you might get similar results from an Aragon 8008x5. I've listened to both Aragon 8008BB and the Bryston 4BST and while they do not sound exactly the same, the Aragon and Bryston have some of the same strengths including controlled "bass slam".
9B-ST for Home Theater Amp
I am using an Acurus 125x5 for the home theater surround setup, but I think my speakers need something with more bass control. The "slam" that I like is just not there in the mid-bass and lower frequencies. Can I get that out of a Bryston 9B-ST? I have the 4B-ST for my separate audio system, and the thing rocks. I'm worried that with a 9B I'm basically just buying 5 3Bs. Anyone have any other recommendations aside from Bryston? I thought about waiting around for the new 6B-ST and combining it with a 4B-ST, but then of course I'd have to get a new amp for my audio system. Ahh, decisions, decisions. Input would be appreciated.