Certification's are benchmarks of knowledge...
As an instructor, I can tell you there are things in a classroom you can learn easier and faster than learning it on your own. In most cases, however due to when classes are offered at a school or a website, it may not fit for your life.
If you want to be useful in your local job market, I suggest this... Call around or look in the paper for what local companies are looking for! from there you can sharpen or add to your skills.
I would hate to see you spend the money and not have a marketable trade to use in your area.