What Eric said. If you'll look around the site a bit you'll discover that Weller 12 is a kissing cousin of Van Winkle Lot B, and Old Weller Antique is something like the runt little brother of Van Winkle 10/107.
You could also make what is referred to here as the "SB Blend", which is equal parts Weller 12 and Old Weller Antique. Lots of folks do variations on that, using different proportions, or using Weller Special Reserve, or even Larceny, Old Fitz BIB or Makers.
I also like what Squire said, which is to call in to question the Holy Grail-ness of PVW. I've had quite a few bottles of PVW15 and PVW20, and they were all great, some sublime. But I've had lots of other bottles that were just as good, some of which are rare and/or expensive (Parker's Cognac, ND Old Taylor BIB from 1972, EC18, Saz18) and some of which can be found just about anywhere. For example, I've had some standard Four Roses Single Barrel, Rittenhouse BIB or some Ancient Ancient Age that were amazingly delicious. Of course nobody is going to gasp with awe when you pull out any of those bottles, two of which are about $20, and all three of which can be found pretty easily (Ancient Ancient Age is a little tough to find, but it can be ordered by the case from the Party Source.)
Finally, for what it's worth, the one restaurant pour I had of Jefferson's 18 was not really all that great. Way too tannic for me. YMMV.