I saw someone talking about this in one of the usenet groups.. basically the general consensus there is that ASPR and SlockPK are the best protectors..
Found them by doing a search for ASprotect on google groups (dejanews for the old-schoolers

, just for kicks when I was bored, just to see what people were talking about..
found lots of bragging about asprotect and all cracks etc stopping after the authors switched. Downloaded most of them (helpjotter, system cleaner, handy productions stuff, etc), no problem cracking
Is ASPR really that hard? that it stops most crackers in their tracks?
Found SlockPK discussion too. several people were praising it.
Going to take a look at it this weekend. BTW where are you stuck at? were you able to get it unpacked? (Not sure if it's even a "packer" like ASPR"
BTW one funny thread I found was one titled "Playing dirty" in the alt.comp.shareware.authors newsgroup. Aparantly Alexey has been promoting asprotect by emailing ppl recommending other protections (armadillo, etc) and sending them the crack
