I am on a tight budget but i am saving as much money as possible so i can buy both rims and tires. I think im going to go with a 25x12-12 inch Vampire mounted on 12 inch rims (obviously). I understand im going to lose power and put more strain on the atv, but i am willing to do this. Im doing this partially to be able to get through the swamp but also to see how hard it is for a 250 to turn over these tires, as i will be able to help others out who own 250s.

The reason im not going eith the zillas is because the 25" sizes only come with a 3/4 inch tread depth. 26" will not clear the floorboards on my Ozark

I wouldn't go with a 12" wide tire with an Ozark. Remember the wider you go, to more power you'll give up due to weight and contact with the ground. I think the 12" would be too much. What width tire do you have now? Maybe go with that width (probably 8") and increase to 25" otherwise I know you'll be dissappointed.
Another suggestion is to look for used 25" stock rims that would fit your bolt pattern. Could save you ALOT of money on rims.
Buck

I currently have an 11 inch wide tire on. I keep searching for used rims but I cant find any. I did find ITP Delta Steel wheels at only $48 each, however, I cant find the bolt pattern on them. My Ozark has a 4/110 bolt pattern but I am having trouble finding the bolt pattern of the ITP Delta Steel rims.

if the ozark is any bit as ballsy as the old quadrunner lt-f250 was, it will have NO PROBLEM turning 25x12x12's all day long!

It doesn't have anything to do with "ballsy". The old 250, as with most older utility ATV's, were geared more for power. The Ozark is more of an "in between" ATV. It has some power but designed more for the fun factor. ALOT more high end.
Buck

Vampires are very good. I know someone who has them