I'd stay away from the C2s. I bought a pair off music123.com and sent them back when I got them becuase someone else recommended the Joe Meek JM27s. Go for the Joe Meeks. You used to be able to get a pair off ebay for 75 but you can buy two separate for a little more.
Forget the Joemeeks. You can find Oktava MC012s for pretty cheap on ebay, and you won't find yourself trading those in anytime soon. For super cheap OHs, check out CAD GXL1200s... you can get a pair for like 130 bucks, and they sound decent.
You can buy a B stock matched pair of Joe Meek JM27 mics with stereo bar, case and clips for $100 (this includes freight too) with full warranty directly from PMI Audio, if they have any remaining. Go to their website : http://www.pmiaudio.com/
Click on "marketplace", then click on "B stock".
I have been using the C2's for o/heads since they were released in the UK.
I use them for various jams etc. when I don't want to risk any of my more expensive jobbies. They are not the most cultured sdc's around and fairly noisy but on o/heads this is not an issue.
Gine them a go you will probably find thet they do the job perfectly well.
Bluearran have plenty in stock at about £39,00.
I've been moderately happy with a pair of Nady CM-90 mics. Their low end response leaves something to be desired, though, so I wouldn't touch them unless you have a good (e.g. D112) kick mic and decent tom mics.