Vespasian

I personally don't live in graduate housing, and I can't think of anyone who does. There are a lot of apartments, a huge range in price/location/emenities so it really depends on what your budget is and what you're looking for as far as a living situation goes.
I quite like being off-campus and in an apartment, personally, and wouldnt want to stay on campus. It isn't for me.

I love the library access, the campus, and the department that I'm in. I've had nothing but good experiences--though I'm not familiar with the department you'd be studying with. I suggest looking up a few current graduate students on the department website; send an email with some questions you might have.
You could probably squeak by, but you won't be living in a particularly nice place (unless you get roommates), but it wouldnt allow for unusual expenses like conference expenses that may not be covered by your department, work in summer may not be garanteed (it isn't, for my department), etc. My rent is $650 (inclues water, trash) but I live in a tiny one bedroom. My stipend isn't quite so high as that, so I took out loans to cover things just in case. Glad I did!
I suggest doing a budget for the area, see how you'd fare for what you want/need. You'll get a much better idea.

To those concerned about their quant scores for Epidemiology: I applied to MPH in Epi with a quant GRE score of 152 (48%ile) and I have been accepted to four programs and waitlisted at one. Of course, both of my other sections were above the 90th %ile which might have helped.

Pro-tip for the GREs: I'm using Magoosh, they've got fabulous videos and it's really helping me. I think I paid $99 for six months access. They have multiple options depending on your needs. Check them out: http://gre.magoosh.com/invite/BC7UGH 
 
PS: I totally don't get anything for that "refer" thing, they just give me gold stars so it looks pretty when I yell at the math videos. 

Hey, I'm 28! Instead of a wife and baby, I've got a Dachshund. If you're not familiar with the breed, the name is German for "little pain in the ass." So, for sure go ahead and graduate because it's not like you'll get another epic semester at Pike, spiking drinks with the brahs. You'll miss your last spring break in Panama City, and the neon muscle tank to go with it. But, alas, SB at "our age" isn't what it was at their age. 
 
That being said, consider two important questions. Are you not applying to programs or getting certain recommendations based on the timing? Either a professor just can't get their act together by October 1, or your dream program doesn't offer spring/summer admission. If that's the case, I'd say wait. No matter what, you'll still be an epidemiologist. But will you look on the wall and see FSU (don't do it) and think "Why didn't I hold out and apply to Emory/Harvard/Hopkins?" If you're absolutely confident in your application choices, you've got one more hurdle. Can you and your family realistically move in less than one month? It seems like you're keeping your apps to the southeast, which would make a move easier. But finding a place and moving in the literal two week span between classes ending at your UG and then starting at the new place would be ... challenging. 
 
If you think you and your wife can do it, I'm rooting for you! For me, I just think it would be too much. Like I said, I'm just leaving two jobs and moving (if I get in) and that's more than enough to totally mess with me. 

I just read your post on SD, but for whatever imagined reason I like it here more. I graduated with my first MA (history, thesis on malaria protocols during WWII) in May of 13 (FSU - don't go there) and decided about 5 months ago that the MPH was the right choice for me. Even just working I feel like taking the GRE again in a month, plus doing the spring apps for Oct. 1/15 is enough to make me want to jump off a bridge. If you're a senior, you're probably 21/22. Take the time. Apply to the best schools, reach as high as you can, and when you decide on a program you'll know you did the right thing for you, and chose the best program of all the options available ... not just the ones open for spring admission. Hell, graduate in December but travel, volunteer, something. Don't confine yourself to Spring admissions for the sake of hurrying up to graduate again.