If you'll be shooting in controlled light, the HMC40 is a great option - because its CMOS (I think) it actually is sharper than the HMC150 in bright light, or at least so I've read on DVXuser. Its in low light where the 150 excels and the 40 kind of falls off.
The 40 is a great cam for the money and so far proves to have been pretty good to those who have used it. I would do some research for yourself: DVXuser has a whole forum dedicated to the HMC40, so use it:
http://www.dvxuser.com/V6/forumdisplay.php?f=194