I have had the Amp 2, Amp 3, HPA 2, HPA 3, and the ML 433. All are very good amps and I could easily live with any of them, I use less efficient speakers than you do so I kept the HPA's and ML 433, but you shouldn't need that much power so if you're happy with the Amp 2/3's, keep them.
Thats my rec....
Thats my rec....