The clones I have are all pretty nice. They are mostly from Special Weapons. I do not have a short barreled 53 nor do I understand why someone would want one.
I have seen a 94 pistol for sale on the web, that might be cool. I will try to find the link for you.
I understand that the JLD Ptr91 is the best clone out of the 91. The ones I have seen are beautiful. Great Northern has a nice sliding stock model at their shop right now.
Stay away from any dircet blowback clones thay should all have a delayed roller blowback. I know one company out there is making a standard blowback rifle, I'm not sure who it was though.
Check out Hkpro.com for answers to any question you might have.
See here for the 53pistol discussion
http://hkpro.websolv.com/ubbthreads/showflat.php?Cat=&Number=274024&page=0&view=collapsed&sb=5&o=&fpart=1#Post275962