My Sony DRU-720A has stopped reading DVDs and I think it needs to be replaced (drive spins but eventually says "no disc"). I run win xp on a 6-year-old PC with 768mb ram. Not ready to make the BD jump just yet. Should I get another Sony, or go a different route? Will buy from newegg or amazon. The LG GH22NS30 and Samsung SH-S223F seem to be the most popular ok newegg. Are the Plextors worth the price?