Once you get a residency getting a job is not a problem, the bottleneck is the residency, some places, actually a lot of the better places do not even look at you if you are a DO. You will find out about that in 3 years. Even if you go to a residency in another state, lets say Chicago, you can still get a job elsewhere.
Its specialty residencies that tend to be tough for DOs, fields like non academic IM, Family Medicine, EM, OB Gyn, Psychiatry, DOs can go anywhere in the country. If you are aiming for academic IM, Derm, Cardiothoracic Surgery, then its a whole other ball game.