Thanks Jason and thanks Fido Dido! (nice 90's reference ;-)
Indeed, the pa75 doesn't seem to be realeased in Europe (I tried Amazon UK, France and Spain), at least not under this name, and importing it from the US is pretty expensive (around $100 for custom fees in addition to the shipping costs!)
I have considered the 60G and 70G, unfortunately I found an important number of persons stressing the aspect of poor focus, unlike the HW300G as you mentionned Fido,
It is indeed less bright, however I plan to mostly watch it in the dark so I give picture quality more weight in the decision than brightness.
Concerning picture size 70 to 90 inches is just fine, a little bigger than a big Tv but no need for a cinema screen either ;-)
Thanks again for you help!