Midwest is by far the most socially fun convention out there. More seminars, tours, parties, and a lot of good deals. Transworld has a tendency to be a bit...overwhelming if you're not used to large trade shows. I am very intrigued by Halloween Extreme and may give that one a try next spring.
If you are looking for tons of straightforward information, classes, and networking. I would suggest MHC in 2013 and then TW in 2014.
HAuNTcon, National, West Coast, and CHAC are fine, but smaller cons and have their appeals. Good luck picking one and keep us informed as to where you're going. I'm sure someone will offer to buy the first round wherever you choose.