I need a laser for acoustical ceilings. We don’t do them every day but when we do their big (6,000 – 8,000 sq ft.) I’ve found some in the $500 – $600 range (i.e.: Robotoolz, PLS 360) then they jump to about $1,400 for a Spectra. Is there that much difference? What should I be looking for in a laser? Any recommendations would be appreciated.