Any Cert. Suggestions?

Was wondering if anyone had some good info on which certification to focus on. I am currently un cert, but have a broad knowledge of all windows OS’s and platforms. Just hate to spend the money on a cert if it’s not going to fit my needs.
I am currently also offering networking & PC Tech support via contracts.
I have also noticed that the market has been going towards windows 2000 cert & don’t want to be part of the big crowd with no opportunity if it is flooded.
Any help or assistance wouldbe great.
thanks