Unless you plan on recording with a stereo mic or two external mics, you will be recording mono.
In all fairness, I am not sure what you expect the quality to be like using the equipment you are using.
it's an $80 recorder in high spl(LOUD) environments. There are ZERO published specs on it
even on the alesis siteand it looks to be discontinued from quite a few places.
It doesn't even say if it has plug in power to operate a mic, so you may even need a pre or battery box and then go line in.
Without even basic information like the line specs, which probably aren't right anyway, recommending a mic
is pointless with a recorder that can't handle it.
My advice, and I am sure most others will be, save a few dollars and get a good starter rig or at least a capable recorder.
Get something that is proven.
Go to our recording gear thread to search for a recorder that fits your needs.http://taperssection.com/index.php?board=11.0