Another vote for the Behringer C2; They aren't high quality mics, but they are reliable and reasonably robust. They work well as an x/y stereo pair, and are good for overheads on drumkits as well. I used them recently for drums at a rock gig, and miked a kit well enough with just the C2s, a kick drum mic and a dynamic mic on the snare. They sound nice at either end of a melodeon as well, but you have to watch for feedback if using monitors. Mothing better for the money, IMHO.
Tim