Just out of curiosity: how good are the internal microphones of the LS-10? (not necessarily compared to the equipment mentioned in the thread, but on a general basis).
You will have a mono recording. Even in places where the PA's are mono, having the room ambiance and crowd noises in stereo adds a lot to the recording.
If mic in sounds that bad, you could try the H2's internal mics. Although I don't think much of the H2 as a recorder using external mics, the internal mics are surprisingly good if the sound pressure levels at the show won't be extremely high. There can be a problem with loud shows because the recording level control comes after the ADC, rather than before. For a loud show, set the mic gain switch to low, but if you need to set the record level below 100 to keep the meters from going over 0 dB, your recording will distort anyway.
If you try this, keep the record level at 100. If the meters are going over 0 dB you will know your recording is distorting and if possible move away from the source until your meters are peaking below 0 dB.