Let me give you my 2 cents.
Is gonna cost you about $8000-$10000 to get your CFI & CFII.
For now forget about MEI or ME add-on.
FL and TX should be in your short list, CA is way too expensive, trust me, I've lived there.
I find that CFI's that come from all these quicky schools tend to have a huge deficiency in knowledge (regulations, aerodynamics, basic principles of aviation), granted they know how to fly and somewhat can get a point across to students. This is an industry where you pay thousands for training, but they pay you pennies on the dollar for employment.
Go out there and read your AIM and FAR, they should be your bible. I recently interviewed a potential CFI, good kid, clean and sharp. The Chief Pilot was about to hire him, when out of the blue I asked him what's IAS, CAS and TAS. This guy received his CFI two months ago from one of those 2 week CFI training courses in FL.....need less to say, hit the books and prepare yourself. You might not need to know those acronyms today because the DPE will not ask you, but trust me you will need to know more stuff than the minimum required to be a CFI.
All in all, find a good school, study and have fun!