Here's a general breakdown of the complexes where most students live:
Campus
University Village. 10ish minute walk to class. Offers studio and two bed/one bath apartments. Price is $559/mo for studios, $867/mo for 2br. If you're interested in these, apply now because from what I've heard, they fill up very quickly. The only complaints I've heard is that they're pretty small (not sure about exact square footage, but floor plans are on their website) and the wifi isn't that great.
http://village.ou.edu/component/option,com_frontpage/Itemid,1/
Bricktown
Deep Deuce. 7-8 minute drive to campus. Offers 1 and 2br options. Price varies depending on square footage, floor plan, etc, but expect around $950/mo for a 1br, and $1100-1400/mo for a 2br. Pricey, yes, but within walking distance of Bricktown, Chesapeake area, and very close to I-235 for convenience.
http://village.ou.edu/component/option,com_frontpage/Itemid,1/
Level Urban Apartments. Right across the street from Deep Deuce. Opened Summer 2012. Offers 1 and 2 br options. Similar to Deep Deuce, except rates are only around $850-900 a month. Level also offers a parking garage, unlike DD, where I believe you have extra for covered parking or a garage. Also a little farther away from the highway (1-2 blocks), which I guess could help with road noise. My take: I've been in a couple of these, and they're really nice. Having a Native Roots Market downstairs is also pretty cool, if you're into natural and locally-grown food. I believe quite a few residents live here as well.
http://www.levelokc.com/
Farther from campus
The Lincoln. 4 miles from campus. A majority of my classmates live here compared to the other apartments that I've mentioned (could be due to several factors--availability, perceived convenience, etc). 1, 2, and 3 br options. Prices are variable, but they're pretty much on par with the DD and Level rates. Definitely more square feet for the price, but if you live in a 1 br, that space is almost too much, honestly. Pros, you'll be living with other members of your class, and the apartments are large. Cons, no covered parking; traffic on Lincoln goes past the Capitol, making travel time a little longer; college students also live at the Lincoln, meaning some nights can be a lot louder than others, especially around the pool.
http://www.thelincolnatcentralpark.com/
Non-apartments
If you want to live in a house off campus, I suggest living west of I-235, probably around 23rd street. There are a lot of rent houses available; however, some are nice, while some are definitely not. Anything east of 235 is really, really sketch. Just don't do it.
I know there are other places that I've missed, but this is a general overview of where
most people I know live. There are also condos available downtown, but these are very pricey even compared to apartment rates. Hopefully this gives you a good idea of where to live in OKC. Message or comment if you have any questions; I'll do my best to reply ASAP.