Don't under estimate the capability of the vandy subs. With push/pull cones and over 400 watt ss amps per side, they can push a lot of air effortlessly. Plus, the quality of the bass achievable with the compensation controls coupled with the ability to tune the subs to the room is quite an advantage.
I'm not sure I understand your concern about dynamic limitations. The 5/7s are 8 ohm speakers which are very easy to drive (due to the high pass filters and the limited impedance variations). It only takes about 100 watts of clean tube amplification to make these sing, with especially georgous mid range and very clean and not harsh high range performance.
As always, everyone has different preferences and it would very interesting if you could try the 5/7s in your room and report back the findings.
I'm not sure I understand your concern about dynamic limitations. The 5/7s are 8 ohm speakers which are very easy to drive (due to the high pass filters and the limited impedance variations). It only takes about 100 watts of clean tube amplification to make these sing, with especially georgous mid range and very clean and not harsh high range performance.
As always, everyone has different preferences and it would very interesting if you could try the 5/7s in your room and report back the findings.