Longs - iconic, spectacular peak to finish on. Ditto for Capitol, N Maroon, and Sneffels
Pikes or Evans - non-hikers can join you for the celebration
Crestone Needle/Peak - if you want to save the most fun ones for last
Chicago Basin - if you like your finishers on the remote, rugged, and beautiful side
Uncompahgre - if you want to finish with the best views (IMHO) of any 14er. Handies comes pretty close
Peaks that I'd find less ideal for finishing on: Elbert (yeah, it's the highest, but not all that interesting besides that), Antero (ATVs), Culebra (pricey and not very interesting), Wilsons group (worthy climbs, but loose enough to detract from the enjoyment of finishing), Sherman or Bross (because they're Sherman and Bross).
As for me, I'm planning to finish on Holy Cross via Halo Ridge next summer. It looks like a gorgeous area, is tough enough to be worthy of being a finisher, but is easy enough that it should be quite doable on a good-weather day. If you're the religious sort, it'd have added significance too...
"If trees could scream, would we be so cavalier about cutting them down? We might, if they screamed all the time, for no good reason."
— Jack HandyMah peaks