gvlagos,
Now that you've tried the Principes, time to try the larger sizes. IMHO, there is a significant jump in flavor and richness from the little Principes to the bigger sizes.
I've have a 3 year old Exclusivo (5.5 x 46) that is beging me to smoke it and I've been getting awfully tempted. Almost had it last night. When I do, I will review it here.
As far as price/value I look at it this way:
PANs & PAMs are premium cigars, not the everyday $1 to $3 smoke. 26s are super premiums. So many have mentioned to me that the 1926 isn't worth the additional money over the 1964. Honestly I've yet to try a 1926 but have had many 1964s and I like the one you had and love the larger sizes. I consider premiums cigar should generally cost $8 - 12 and super-premiums cost $13-$25. I can generally afford a premium once a week and a super premium once every few weeks.
Prices I've paid for 64s have been mostly $8-$12 premium depending on size. At that price range, the quality very much merits that price, Especially for the larger size Padron Anniversaries Maduro. All I can say is enjoy them any time you can and thanks for initiating this thread on a great cigar.