In my opinion the HD72 is not worth the extra $600.
The Mits HD1000U and Optoma HD70 are the 2 best bang for the buck Hi-Def DLP projectors right now. Both MSRP for about $999 and both can be found quite easily for $900 or less.
I own a InFocus 4805 480p DLP and have been wanting to upgrade for several months now to 720p DLP, but because of cash flow pblms have been waiting. I have been following all the threads on this forum about the Optoma HD70/72 and the Mits HD1000U/3000. Originally i was leaning toward the HD70 because it was the first Sub $1000 720p and it was also getting good reviews.
But then the HD1000U was released and it seams to be the best choice now, it can be found for a few bucks cheaper then the HD70 and it has some technological advantages over the HD70:
1. Glass lens, sharper focus, HD70 is plastic
2. 10 bit color processing, HD70 is 8 bit
3. Brighter, has more lumens then HD70
For the above 3 reasons I was all set on finally pulling the trigger and buying the Mits HD1000U for $860. But now Costco has muddied the water by offering the Optoma HD70 at Full list ($999). Even though the HD70 would be $140 more expensive, and the Mits HD1000U is probably a little better in some quality issues, i think that the great return/waranty policy you get from Costco has me leaning toward the HD70 again.
I am finally close to scraping up the $1000 needed for this upgrade, i wish my beloved 4805 would just die already so i would be forced to make my decision and purchase a 720p already, LOL!!!!