Bass impact is not the forte of planars, in general. From what I've read, this is due to the flat diaphragm, which simply pushes less air at your ears than a dynamic driver would. Outstanding impact in a planar is still going to fall short of pretty good impact in a dynamic. Something like a Fostex is in an entirely different league when it comes to the visceral
feel of bass.
That said, you are right to go balanced. The additional power and control that balanced offers should help improve the impact of the bass. Likewise, an amp that can push a lot of current helps considerably. I don't know enough about the Jot to tell you if that's an example, but Audio-gd and Questyle amps sound amazing with LCDs.
Lastly, the X is a definite improvement over the 2F when it comes to bass and treble, but you won't get full on chest-thumping impact or extremely smooth extended highs. For those particular characteristics, I would recommend a dynamic, such as the Elex or the Clear. Those two areas are much more the things that dynamic drivers do best. What the X excels at is detail in the mids and bass, without being vocal forward or shouty, and depth to the music. While I do think the X is superior to the 2F, I've found them different enough to keep both. The 2F being a
comparatively laid-back, relaxing listen.
Oh, and you shouldn't ever have to pay more than $950 for an LCD-X. Plenty of b-stock, refurbies, and used options available. Keep an eye on this thread for deals (including this deal on an X):
https://www.head-fi.org/threads/the...the-first-post.692119/page-1868#post-14873038
Hope that helps!