I've heard that Manhattan and Stillwater are quite similar. I've never been to Manhattan, so I can't confirm this, but the size of the towns and the relative student load at KSU/OSU are really similar.
I know there aren't a whole lot of people interested in OKSU on this forum, but for anyone interested now or in the future, here is what I think of Stillwater.
Now, I grew up in a town even smaller than Stillwater, so I'm not from a big city. Therefore, there are things that some people would see as negative points that I probably will not.
First of all, Stillwater is a friendly place. Crime rates are low, and most crime that exists is petty theft, like someone breaks into your car to steal your purse. I would not be concerned parking my car outside my house at night. I would not walk around the lake alone at night, but college students in any sort of concentration seems to attract some negative attention. Rapes happen, but if you aren't out alone and don't open your door for strangers, I think you're like 99.99% safe.
The people here will nod and smile as you walk by them. Doors will generally be held open for you (not as a girl, but just a courtesy if someone is going out or coming in just ahead of you) and cashiers are typically very talkative. Everyone is basically just really... nice. It seems like, in larger towns, people are much more concerned with where they're going and what they're doing, but here, people stop to talk. Which can be annoying if you ARE in a hurry, lol.
The town itself is fairly small - I could drive across it in 10-15 minutes with no traffic. However, there IS traffic, and it even gets a bit congested at lunchtime. Part of the reason for this is that it's not an especially bike-friendly town. There are large sections of roads without sidwalks and with tiny non-official bike lanes. As someone who has almost run over a cyclist (who swerved to the middle of the lane going up a hill in a 45MPH area, right in front of me, lol) I would sincerely hate to ride a bike for any distance. That said, people do, and it is MUCH easier to get around on a bike on and near campus. If you lived close to the school, you cold bike there with no problem. You just might want to get a ride to Walmart, the movie theater, etc.
Okay, so the town has... two Wal-Marts, a movie theater with 10 screens, a bowling alley, Lowe's, Belk, Ross, JCPenny, Big Lots, The Buckle, American Eagle, Bath & Body Works, Old Navy, Hobby Lobby... there isn't anything like a mall. There are rumors of a Target (yay!) and a Best Buy, but those remain to be seen.
For food, there are a number of restaurants, but I can guarantee that, if you eat out a lot, you WILL get tired of the food options here. Four years is a long time to eat all the same places. I won't list all the food places (though I could!) but if you want to know if we have a ______, just ask. I will say that... there is no good italian.
One thing to keep in consideration is that Oklahoma City is an hour one direction and has anything you could ever want, and Tulsa is an hour the other direction and has almost as much stuff as OKC. The drive isn't bad either way. So, there is a place for your big town needs.
Uhmmm... lets see. Demographics are good, there is a fair bit of variety because it's a college town. Racisim isn't an issue that I know of (white girl here, so can't say for sure, heh) and there are a variety of chuches and cultural centers as well.
Rent here can vary from $300/month for a dumpy place or something shared with roommates, to $800/month for a duplex or a mortgage on a house. You can get more expensive, but only if you're trying (like you bought a $200,000 house or something). You CAN buy a house for $80-$100k and it won't be a complete dump... it's a pretty affordable place to live overall.
I'm running out of ideas of what to tell you guys about, so if you want to know anything more (LOL) then you can just PM me or post here. Sorry for the length, I just like having something I can tell y'all about.