An M22 may have a smaller sweet spot than a VP100, but I do not neccessarily know for sure. It would be something you would need to try out for yourself.

If you cant afford the VP100 now, why even bother with an M22? Just enjoy stereo for now and upgrade to the Vp150 later like you rreally want to. You will be a happier person not having to deal with the dreaded upgradeitis.