I think you are in the same situation as I am.
I have narrow my choices to 3 projectors, Sanyo PLV-3
0 and both Projectors you mentioned.
PLV-30 is recommended many times at avforum.com (UK) as one of the best low cost projector. After I saw the demo of plv-30. I know that I couldn't live with it's screen door. I saw the demo of PG-M10S last friday. It just simply better both brightness and contrast compare to PLV-30. I'm going to see the demo of LP340 next week.
One thing I don't like about the PG-M10S, I still can't figure out how to celing mount it.
Anyway, if you feel like chat with me, please call me at
01-9164234. I live in Bangkok, Thailand Too