I would like to stay all JBL if feasible.
Generally raw JBL drivers are not something you could describe as "feasible" though I suppose it depends how deep your pockets are and how brightly your love for the Orange Badge burns. That said options here include the 2241 which is a very decent driver and one that can be had for somewhat reasonable prices used, but it's easily outclassed by more modern drivers from RCF(L18P300), B&C(18TBX100), and even Eminence(Definimax 4018LF) and you can have brand new components from those manufacturers for about the same or even less than used JBLs. The 2242 is the next step up in the JBL line but again you can have 2-3 drivers from the other guys for the same cost a single new JBL.
Now as for what drivers would work best here I suggest you download a free copy of WinISD Pro and if they're not already loaded in the software enter the TS specs for the drivers you're interested in and see how they perform in a model with the internal volume and tuning(port dimensions) of your boxes. FYI-- the Pro version of this software calculates port air velocity and driver excursion at power levels among other things and therefore produces a much better picture of overall performance than the non-pro version.
http://www.linearteam.dk/default.aspx?pageid=winisdpro