Long story short...if you want musical, put those Fortes on some tubes. Switching from one "mid-fi" solid state amplifier to another "mid-fi" solid state amplifier using the same solid state processor isn't going to make that much of a difference IMO. It may result in a "different" sound, but I doubt it will get more "musical.
I have top of the line B&K seperates for 5.1 movies and a 2 channel tube system for music with RF-7's. I recently tried a Musical Fidelity A5 integrated with the RF-7's. I would rate tube system #1, B&K #2, Musical Fidelity #3. Now the A5 is an integrated, so while it is no slouch, it is certainly at a disadvantage being compared to separates, and I felt it was a liitle forward with Klipsch. While my B&K system is "impressive" in some folks eyes, it doesn't come close to a JM Peach and VRD amplifier musically.
Another option might be to try a tube pre amp with a solid state amplifier, I think that would make more of an improvement than switching SS amps in and out unless of course you go big dollar SS.