Keep in mind that 68W opt 40 contracts are rarely out there, the Regiment primarily recruits its medics out of AIT now, so that they can look at your performance there and gauge your medical aptitude for going on to something like SOCM. Just something to keep in mind. If you want to go that route, and 68W opt 40 isn't available, then 68W opt 4, or even just a 68W by itself are all good options, provided your willing to EARN your spot at RASP.
If none of those are available, and your primary goal is to be in Regiment, then 11x and 13F are good choices as well. Any intel job in the 75th is usually a good grab as well. Oh, and 25C/U...if your into that kinda thing.
If you are not dead set on the 75th, then of course 18x is a good grab, as well as 89D and 35P both are good jobs that come with great benefits (actually, the best that are available right now) as well as great training.
Don't be a retard at MEPS, and also don't be overwhelmed by the pressure to enlist while there. Make sure you are polite, respectful, but also let them know what your intentions are. Unless you want to be a cook, then don't let them talk you into a 92G w/ opt 40 telling you "hey man, its a foot in the door, you'll still be a Ranger". Remember, in the 75th there are basically four MOS's that go out on target regularly: 11B/C, 13F, 68W, and 25C/U. The other MOS's will get to go out every now and again, but not with any regularity.
Just figure out what your goal is while in the Army, and why (specifically). If you want some feedback on here, then feel free to bounce it off of us so you aren't making life altering decisions based on false pretenses.