Dave, I really appreciate your knowledge and help.Most people must have been either quoting manufacturer specs or just plain guessing without consideration for past Epson 3000 series measured performance. The white being different mentioned above was simply saying that the extra 100 lumens of the 3800 will allow it to go a little brighter than the 3200 which will be most obvious in brighter whites, but it won't go any darker so no improvement in blacks.
Anyone trying to decide between the 3800 and 3200 right now based on contrast and black levels has three choices: trust published manufacturer specs for contrast which are known to be exaggerated, make an educated guess based on the previous history of measured 3000 series performance or wait for a direct measured comparison of the 3800 and 3200 from a reliable source which could take a long time.
If it were me spending my own money and I didn't need the extra 100 lumens or internal speakers of the 3800 I'd save $200 and go with a 3200. YMMV.
As I mentioned earlier, I have a 90" screen projected from 380cm (150") distance.
Per your recommendation above, as there is no real comparison just yet, so if I guess based on previous history I shall be fine with the 3200, no problem here.
However, my question is "If I trust the manufacturer specs..." - in that case, my question is - will I be able to benefit from the 3800 contrast (again, assuming it indeed has 100,000:1) in my living room, or due to the environment (cream walls etc.) the benefit will be marginal or even not at all?