Hey Stacey, I know your post was a few days ago, but maybe you'll still get my reply.
I was a CNA for a year, and now I am an EKG/CV tech in a hospital. I *love* my job now, and definitely recommend working in a hospital!
It sounds to me like the class you're taking is equivalent to a PCT class - my hospital uses PCTs for ER techs, monitor techs, OB/L&D/Nursery/NICU techs, and ICU techs. It sounds like the class you're taking could offer options in all those areas, in case you haven't considered them yet! Definitely look into the requirements for those sorts of positions at local hospitals. If you're going to go this route, I would advise you to get the phlebotomy certification - you might be able to consider hospital or lab positions as a phlebotomist as well! It's good to have options.
As for hospital vs. MD office - it really will depend on your area. In my area, it is *very* hard to get into an office or clinic job. They're in high demand because people like the M-F 8-5, no weekends, no holidays schedule. Office and clinic jobs tend to pay significantly less (in my area, anyway). Someone doing my job in an office or clinic will probably make about $5 less than me per hour. For the additional money, I work a non-ideal shift (every weekday 3p-11p), am on call on weekends, and usually cannot get holidays off. I have to schedule my time off several months in advance so my manager can get it covered.
BUT, I love my job! It's fantastic experience, it's fun, it's usually not very stressful. It's great for me, because I'm also a full-time student. I love the hospital environment and would not change it for anything, even weekends and holidays and evenings off.
I'm sure employers will look at your CMA experience as healthcare experience, which should be a huge plus, even if you don't have any work experience doing EKG/phlebotomy yet. That may be enough to get around the 6m-2year experience requirement, depending on the facility and the qualifications of the other applicants.