If I were you I'd take the minimalist approach...Start with just the projector and the Greyhawk 1st. Then if you have problems (ie... moire ) fix them then. I say this because I have had 4 different 10HT's using a DALITE Matte White Screen. Each 10HT displayed the moire pattern differently. It's funny, my 1st 10HT was the worst almost unwatchable... The 2nd thru the 4th were moderately to barely noticable. (I'm a custom installer by the way-not a nut case who just kept returning the 10HT's)
I have also found each 10HT or any projector for that matter to have a slightly different picture. Meaning that I have never seen 2 identical models look exactly alike. I think this may contribute to why there seems to be such a varying opinion on the 10HT.
If your are truly a SONY nut, then you might want to consider one of their 4/3 panel LCD projectors (ie..PX20, PX21, PX30 or PX31) along with a panamorph lens. I personally find these projectors higher lumen output (1400 to 2800), micro lens array (PX30/31 only), better lens quality, and apparently better contrast ratio to offer the consumer a great alternative pick, especially if ambient light is an issue. These units are more or less about the same money as the 10/11HT (street price) and come with the same warranty, etc... Now I have never seen this units matched up with a panamorph lens, however, I'm sure someone else out there has. More importantly, I have never seen the dreaded "moire" problem. These units also use the same service menu codes as the 10HT for tweak happy picture person...
Just my 2 cents...