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Admittedly a Viva fan, but I don't think that there's anything in the price range you are thinking of that will match the tonality of the Viva you own now. Yes, there are amps that will play louder, but if you value that "in the room" presence, you aren't getting it for 3K. I haven't heard the Mastersound 845 amp, but I did own a Due Trente and, while it was a very nice amp, was much more neutral (colorless?)than the Viva. Personally, I would not sell the Viva until you have something you think you like better. Best of luck.

52Tiger - no, I haven't heard the 300B, but I have heard a few versions of the Solista and the LT and the smaller push-pull they make. All the ones I've heard have a very palpable presence that is extremely addictive once you get used to it. IMO, without that "in the room" sound, a hifi system is nothing but a glorified PA. I've heard some other very nice amps, by Jadis, the big Cary SETs and Shindo, but nothing in the price range you're talking about. Maybe you could pick up a used older Solista in the 5K price range, but what do you do if it breaks? But the old Solista was a damn nice amp. And it has 845s to boot.