15feet diagonal is way too big for the X1 to handle...max you can get without sacrificing PQ is 100" across 4:3 AR at a distance of probably at least 3.5m and up...you can use infocus' distance/screensize calculator but as ive said, dont go over 100" otherwise its crap
so far, its quite difficult to find an online retailer from the US that accepts international orders, accepts credits cards not issued in US and/or delivers internationally
this was my option before but ended up buying from a UK based online retailer kasi nga wala ako makita, and besides, i computed the customs charge and VAT plus the delivery and added it to the cost, would turn out almost the same as ive gotten it over here so no difference at all
also, the free 3 year extended warranty and rebate is not honored outside the US and have expired already last 31 MAY
for screen, get either a blackout fabric or a parkland plastic...right now im using a blackout fabric and its doing great, somehow minimized the rainbows...am still looking for a parkland plastic though