Whenever I want to practice, I take my classical guitar to the beach and play along a set-list of recent DT I came up with a few months ago:
1. A Nightmare To Remember
2. Forsaken
3. The Looking Glass
4. The Bigger Picture
5. Behind The Veil
6. Repentance
7. This Is The Life
8. In The Presence Of Enemies Pt. 1 (I would also include Pt. 2, but there are a few bits way too fast for me - I need to master them)
9. Along For The Ride
10. A Nightmare To Remember (yes, a second time - it's just so fun to play along)
I tune my guitar a 4th lower, so it's like I'm playing a 7-string guitar without the highest E-string, which I don't mind much (if a song uses that string, I play the notes in another one, or I play the bass part).
Besides that, I'm not trying to learn any new stuff. A friend and I have started writing music together, so I much rather prefer using my free time to come up with stuff of my own.
I am also learning The Man I love by Gershwin, a nice jazz piece and Dance in Hungarian Ritme 2 from Bartok, a very dissonant but groovy piece in 7/8.
I have also started on the solo's for IM's Blood Brothers, but I have a lot of difficulty with getting the bends right.
I'm curious about the Bartok you talked about - I'll try to listen to it.
And that's one fine Maiden song. Not speaking about the solo (I don't care about them), but the guitar riff on the high strings - it re-appears throughout but with little variations (in volume, energy). Such a cool, touching melody.