I've been experimenting with the JB3 and different rigs and what I can tell you is that if you plan on taping rather regularly SAVE YOUR MONEY! With cheap mics your going to have decent result, you'll think your recordings are pretty sweet for a while. Then you're going to say wow, this sounds pretty good but I know I can have much better recordings that this. Now you're going to buy another set of mics and a decent power supply for them. Then a bit later, your going to buy better gear and so on. Save your friggin cash and buy at least decent mics to start with, the sound professionals cmc-8 mics are pretty sweet and there's alot of folks who are very happy with the results. I'd stay away from the sp-cmc-4 (AT853) unless you can swing the cash for a phantom power setup (search for it and you'll find alot of info). The JB3s weakness is definately it's ADC. The recording levels are not as high as you'd want them to be but this can help if you're going to record friggin loud metal shows because you will not overload the jb3 ever without a preamp. So decide how good you want your recordings to sound and then decide which mics to use. If you can get the money buy a pair of DPA 4061 mics...best tiny stealth mics out there. It'd also be a good idea to download some recordings made with the various mics that your looking at since each mic sounds different.
Now if you really want some cheap mics fast I do have a pair of Giant Squid Audio binaurals with a battery box attatched that I will sell you for $50 (these are the "pro" mics that they sell). I paid $85 and only recorded with them twice.