I have not had the issues re: bass and upper registers as Nealhood. I note my JD-100 has the following after market mods (I bought my unit stock with Sovtek 12AX7s): 1) a cryoed Chris VenHaus Flavor 1 PC, which brings in both the bass and upper registers; 2) Sylvania Gold Label JHS 5751WA triple mica blackplates, which make this CPD, in my system, scary good for the $; 3) a 22 lb. granite slab supported by Vibrapods, the Jolida sits on top of the granite, which helps reduce any vibrations to the unit; 4) a 12 lb. piece of marble on the top (resting on coasters), for even more vibration reduction; and 5) Herbie's Hal-O 9 tube dampers in place of the stock tube covers. Please remember this is what works in my system, with my components. Results with your components may vary.
Best of luck in your choices. I second the motion to listen to both units, if you can. I also note I was happy to use the $$ I had left over from the JD-100 purchase on other audio equipment, including purchase of the Sylvania tubes!