As long as you can kill external lights and completely cover windows you can benefit from the NX5 over the epson. Especially if you can zap all external light at night you'd be ok. I'd definitely dump the 0.8 screen and get a pure white or even 1.3 gain type screen instead. The 0.8 is going to work against you where you have less light on the NX5 vs the Epson.