Glad you tried those two films out. As for Crank 2, not to sound juvenile, but I prefer it due to Nev/Taylor's increased frenetic energy. For me, as an experience in rough digital and editing, High Voltage goes farther than Crank, into the borders of action avant garde. Damn! I'd love to see a McTiernan on the big screen.
Since I watched them back to back they run together a bit so I can't cite specific examples, but I felt like the first film was considerably more energetic. Either way I enjoyed them both and I'm looking forward to taking a look at Gamer soon. What other films do you see probing action avant garde? † I was impressed with Deja Vu. The conflation of media and memory against the backdrop of post-Katrina New Orleans was a smart, emotionally sharp move. I'm paying attention now. I picked up Unstoppable after that, which I'll get to soon. Any other recommendations for Scott?