In my opinion the EAT KT88 Diamonds. I haven't tried the Treasure Z's or Psvane. The original GL Gec and Genelex are indeed hard to find and when you do the price is the same or higher than the EAT's.
Here is a pair
http://www.audiogon.com/cgi-bin/cls.pl?accstube&1330013434&/Genalex-gec-nos-kt-88-kt88-pai
Here is a pair
http://www.audiogon.com/cgi-bin/cls.pl?accstube&1330013434&/Genalex-gec-nos-kt-88-kt88-pai