You should definitely use the 57's on the kick and the snare. Cheap mics, like the radio shack mics you own, have a much "looser" pickup pattern, which is good for your purposes here. Use them as the overheads. Try different positions, such as XY stereo, or simply put one on the left side of the kit and one on the right. The XY pattern will minimize phase problems, which usually takes a heavy toll on the snare's sound. try different positions. I once had a guy advise me to put two mics in XY right in front of the kit at about the drummers chest level, 5 feet away from the kit. I never tried it, but you may want to experiment. If you run into phase problems [symptoms will usually include having your kit sound really small and weak] try using triangle miking, which would be a 57 on kick plus your overheads, left and right. that usually yields great natural sounding results, however, is achieved with good overheads. Don't be discouraged to try though - cheap mics only mean more work.
