I tend to agree with bgross. Vintage speakers should have a vintage receiver. Sansui, Marantz, Kenwood, Macintosh. Upper end models of any of the brands fully restored (pots cleaned, replaced, caps and diodes replaced) should be available within your budget, and will compliment the JBLs the best. My son just put together a classic system with Sansui 5000x and Wharfedale Achromatic speakers. Looks great, and the sound is amazing. Compares well with any of more current recommendations. Great sound stage, focus and PRAT. The adjustments of response on both the receiver and speakers, let you tailor the sound to the room, and even helps move the presentation forward or back (by adjusting the mid response) as desired.
Also want to take a moment to comment on the Hegel recommendations. I have listened to the Hegel 390, and also some of the lower line models. Listened with Revel Performa M105. Initially very impressed, but further listening at another session, I find the mids to be smeared together. Great bass and Hi end, but the mids just lose instrument definition and placement. Maybe with larger 3 way speakers they work, but not for me. I would not recommend Hegel for big band or classical. YMMV.