All depends on what you plan on doing with it. I got the 36 hybrid to use on my deck and it is perfect for home use.
I plan on getting a 48 for use in competitions.
CMJ - KCBS & Carolina BBQ League (NCBBQA)
CBJ - MBN, NCBS, NCPC, & SBN
CTC - KCBS
Pitmaster and chef - "4 Lil' Pigs" Competition BBQ Team
Author of "A 'Q' Review"
Lang Smoker, BDS, & Holland "Epic"