RHanson---Danny Richie at GR Research builds x/o's using premium parts for a reasonable charge. You need only provide him with the schematic.
GKR---Also from Danny is a very special sub that would be incredible with your 1.7's (as well as any and all other dipole/planar loudspeakers), his Open Baffle/Dipole sub using the Rythmik Direct Servo feedback system. You can read all about it on the GR Research website and Audiocircle Forum.