I ran that mic into a MD for awhile then swithched to the jb3 and was seriously disapointed! I don't know what model md you run but mine had a much nicer front end then my jb3. you may want to stick to the md untill you can afford a decent pre then look into mics etc. I was very pleased with the small handfull of shows I recorded ecm 907>MD. but the jb3 required tons of gain boost which brought in a lot of noise. also the adc in some of the higher end sony md's is actualy quite decent and will sound better than the jb3 even taking into concideration the atrac compression.
I would stick to what you have for aud recording till you get a pre. once you get a pre throw the md to someone just starting out and the circle continues. save up for a ua5 or something. the sony mic is ok and can handle phantom power. so you can run that while you shop for 'real' mics.
get a small handfull of cables and adapters for the jb3 and use it for patching only. an optical cable of decent length, a fairly long pair of rca cables and an rca>mini stereo adapter is all you really need. only run the jb3 optical or line in with little to no gain added and you'll be fine.
have fun,
Kris