Hi there, i have the Z5 onto a 96" Da-lite screen. I made the frame from this link and i used BOC originally but bought proper screen fabric just to ensure I was getting optimal performance. Boc worked very well and the total cost in CAD was $140, add another $150-$500 for fabric if you choose to go that route depending on size and type of fabric etc.
http://members.shaw.ca/danhanson/Theater/screen/screenproject.htm


The Z5 is an amazing pice of kit especially considering the current prices. PQ is excellent with a good upconverting DVDP and jaw dropping with an HD player.

Sorry, i cannot help with your speaker question, I have M80's. However, my room is about 14' wide and I decided to go with a smaller screen because of my need for speaker placement(audio is even more important to me than video). Besides, 106" is the max recommneded screen size for the Z5.

Enjoy, its a fantastic experience.

Chris

Emotiva DMC1, MPS-1 ,M80v2 ,Klipsch RC64,Mirage Omni260 surrounds,Paradigm PW2200 sub