The JL's are great subs and integrate well. I have a pair of F110's and they are very musical. JL suggests crossing at 80 and I think that is a bad idea with full range speakers. I have mine crossed at 45. Read Valin's review in the Absolute Sound he gives some great tips for integration.
Speakers or Amplifier
Thinking about another upgrade and looking for opinions on if I should upgrade my speakers or amplifier. My current system: Aerial 7T speakers, Jeff Rowland M525, Bricasti M1 DAC connected straight into the M525, and all WireWorld Silver inter-connect, power, and speaker cables. My room is 20' x 26' and treated with GIK acoustics. I listen to contemporary Jazz. My budget is 10K.