Those Radio Shack tom mics are $19 right now by the way, The 603s are a good reccomendation but If you have a good room the ECM8000s are even more cost friendly, round them out with an AT pro 25 and you got a good kit for arround 100.00
ECM8000s 20.00 each (MF)
AT pro 25 35.00 each (on Ebay)
Now the best mics are probubly more for just one and not that much of an improvement for the buck