I think that's your best bet, though your Jamos are going to probably want more power than his JBLs, which could lead to the impression that the JBLs have more scale at any given level. Which, maybe they do or don't, but I don't even look at standmounts like those Jamos anymore unless I figure I'm going to have an excess of power behind them.That sounds like a great starting point!
An underpowered speaker like that will be pretty lifeless. Imaging will set back and not project well. The amp will be straining and possibly distorting/clipping. Any articulation its capable of will probably be lost as it'll be up against its limits just trying to get a usable volume. On top of that, those drivers will not be forgiving.
All that said, the PS Audio amp you mentioned should have enough power for them.