If ROTC is an option, I would really really suggest you do ROTC (even if it means driving 20 miles to get to the detachment).
I know why you're considering OCS instead of ROTC; it looks very enticing, I agree. "Wow I only have to work 3 months to get a commission! I don't want to waste 4 years doing ROTC. I'm going to enjoy college life!" is what you're thinking, right? Sure it might suck to have to do ROTC in addition to college for 4 years, but at least you get to go home at the end of the day; at least you have privacy (you will never realize how important this is to you until you go to OCS); at least you don't have to be afraid of getting beat down by your DI every waking moment; at least you can LEARN the way YOU want to learn; at least you don't have someone looking over your shoulder every single second; at least you can eat whatever you want; at least you can eat the way you want (you like eating by the numbers?); at least you have time to heal if you get sick or injured; at least you have time to improve on anything that you need improving on.
Trust me when I say OCS is going to be the WORST 3 months of your life. Get sick? Tough ****. Suck it up and keep going. Injured? **** you, you aren't pushing it hard enough. Quit making excuses. You don't like 18 hour work days? Tough ****. You can't preform on 4-5 hours of sleep? Too bad. Can't memorize this booklet WORD FOR WORD? Get ready to get beaten the **** down. Not being assertive or loud enough? Get ready to be harassed by EVERYONE.
Stretch the commissioning process out man. You really don't want to cram 4 years worth of RTOC into 3 months of your life. It sucks.
I know this sounds a bit harsh, but this is the reality of OCS--this is the mentality there (not just the DIs, I'm talking about your classmates as well).