OK, last cigar ever, PAM 64 "A" (I'd want it to last as long as possible).
One cigar for the rest of my life? Believe it or not, La Aurora Untamed (Rob & Corona Gorda). This one hits all my sweet spots. Sweet spice, cocoa, coffee and pepper, connie broadleaf maduro wrapper, med/full strength, consistent construction, tons of smoke, and if you take advantage of the occasional sale, under $2 at Famous after discount. I've already gone through 4 boxes and have another 6 in the coolers.