spreadahead, checking in from Canton on the east side here.
i think you might want to check out the new audix micros, they have two versions, very small mics with amazingly good sound for less than you are looking to spend. otherwise, if you can make the jump to DPA 406x series, they are totally respectable mics but you are going to be stuck with omnis.
if you are willing to make the jump to full body mics, you will have great success with the AKG 391s, but keep in mind they will require phantom power that the AD-20 will not provide, you will need a ps-2 or some other phantom power device.