believe it or not, i LOVE the MXL V67 as an overhead. the hashy midrange it has (which you can really hear on some vocalists) really tends to bring out the woodiness in drums, and the non-hyped high end tends to tame cymbals--especially in bad rooms. i wish i'd discovered it earlier!
the SP B1 is ok in a pinch, but i like it a lot more on snare (think concert snare) than as an overhead. i've used it as a snare mic on a kit before and while i like the sound, the pattern is just too wide to be effective. the B1 just doesn't excite me as an OH.
a pair of MXL 603's will also do the job just fine, but their hyped high end (which helps them excel on acoustic guitar) can bring out the harshness in some cymbals and rooms. it's too much for me.
cheers,
wade