my ultimate plan is to get a good projector for movies(so that could be the jvc or sony) and get a lampless led/laser/hybrid projector for casual use.
I don't know if I see enough improvement with your second projector choices to justify a dual setup. the sony or jvc are reasonably bright. I have the x35 and can use it with my seating lights on full. the sony is supposedly even brighter, and better with motion handling/input lag. I think if you went with the sony there really wouldn't be a reason to grab the Epson or sharp
the other thing you could maybe do is just add one projector to your rs40 now, and save the money for a future upgrade.
ie, i'm assuming you'd want something better for sports and a bright room. so buy a bright DLP now. keep using the rs40 for movies. you can always upgrade the rs40 if you want to later.
Displays: Samsung PN64F8500/JVC X35
AVR: Pioneer VSX-1130K, 7.1/5.1.2 audio
Sources: HTPC(Enby), PS3, XBOX360, Wii
Control: Harmony One