The reason people are recommending the FR2LE is because it's a great 24 bit all-in-one. That means that it has the pre-amp, ADC, and recording functions all in a single unit. An alternative would be the Marantz PMD-660 but it's a 16 bit all-in-one. The difference between 16 bit and 24 bit is mainly that 24 bit provides addtional headroom to prevent clipping, but if you monitor levels closely when recording in 16bit, it's plenty fine for getting great recordings (we did so for many years before 24 bit came along). The 660 stock is fairly raw when it comes to recording live music, so most people have had pro mods done on it to bring it up to sound standards for our use. The FR2LE also gets modded alot, but there's been alot of discussion lately about how the FR2LE sounds pretty nice stock (without any mods). A third option is that there are a brand newly announced low profile all-in-one hitting the market as we speak...or shortly into 2009...the Martantz PMD661. This is similar to the 660, but is 24bit, smaller sized, and uses SD cards instead of CF cards.
With the microtrack, you'd need a preamp of some kind, which whould also provide phantom power for the mics. Just like mics, preamps come in all sizes, flavors, costs, and qualities.