A lot of bikes can work at 245. I would start with a hybrid. Although you are heavy, you are not so heavy that you need a grandma bike, as you mentioned. But, you might find a full road bike uncomfortable at this time. There are tons of good hybrids to be found on CL. By the way, I bought a MTB and hybrid at about that weight, and now I am in really good shape. You can do it too, you just need to keep riding and likely change some eating habits.