If you are looking at DSP solutions, many of them also have digital crossovers for subs and then the extra channels of DAC that that requires. So going that way, you could avoid the considerable cost of the CR-1.
Examples are the Anthem STR Preamp, miniDSP SHD, and DSpeaker X4. I'm using the Anthem to drive 4 subs now, with very nice results.
I have no doubt the JL is excellent (a friend who could buy anything uses it).
A lot depends on whether you want to maintain an all-analog path or not.
So I'm not recommending any specific gear, just that you consider your objectives and what kind of signal path would let you get there within your budget and with the kind of sound you enjoy. Luxman and Spendor make a nice system!