You'll get two schools of thought on that. 1) SWA guys, and 2) everybody else. I got the 737 type, and I don't necessarily regret it, but it hasn't helped me get a job either. Personally, I'd save the money and focus on building the time that the majors value. Everything else being equal, quality hours (jet, TPIC, etc.) are probably more valuable than a 737/320 type. I'm certainly no expert, but that's the impression I'm getting at this point. Others can chime in if they disagree.