The theme of the Paganini caprice number 24 is one of the most famous in music. It's certainly a show stopper on any instrument and is often used by violinists as an encore. This theme has been experimented with by many many arrangers and composers. Undoubtedly the most famous was Rachmaninoff who used it for his "Rhapsody on a theme of Paganini." But there were many others including Brahms who wrote two books of them. IMO, this theme traces its history back to the Mideval theme "Dies Irae" which also fascinated many composers including Berlioz who used it in the witches sabboth of his "Symphonie Fantastique", Rachmaninoff used it in many compositions including "Isle of the Dead" and most notably Liszt used it in a spectacular piece called "Totentanz" or dance of death. Rachmaninoff used it for three of the variations in his Rhapsody. However, in listening to Bach carefully, I think that the Pasacaglia was yet another variant on this theme. I view the Pasacaglia as a stripped down version of the Paganini theme and the Dies Irae as further stripped to its barest essentials. Small wonder that every instrumentalist who makes any pretense of being a virtuoso wants to play it on his own instrument. But it is a killer.

BTW, here are some of the discs I've referenced.
The Liszt can be found on Philips 438 906-2 Van Cliburn 9th International Piano Competition played by Valery Kuleshow
The guitar arrangement can be found on Romantic Guitar Favoirtes Naxos 8.550296 played by Gerald Garcia
There are also many of them in a Vox Box CD3X 3020 called Paganini Variations which includes variations by Liszt, Brahms, Rachmaninoff, and Schumann.
You can also hear some very wild variations by Witold Lutoslawski on Duo Piano Extravaganza, Martha Argerich and Friends on Philips 446 557-2.

I'm sure if you do your homework, you can find countless more but these are among the most famous.

BTW, we have in our collection every recording Heifetz ever made on both vinyl and cd. As I recall, between the two sets they were well over $1000. In my house, much more emphasis is put on acquiring recordings than equipment. I think we've reached a point of saturation where merely cataloging and storing them is a major problem.