I would get a less than $100.00 Blu-ray player. But make sure it's Blu-ray 2.0 compliant so you can stream movies from Netflix and others. And make sure it has the kind of networking abilities you want it to have (i.e. wired or wireless.)
Or
If you might get a new 3D TV you could get a new 3D Blu-ray player. The PS3 is great, but starting to show it's age as it can't quite keep up with the new 3D HDMI 1.4 standard for full 3D. You could get a nice 3D TV for your main room, and move the older HD TV to the other room.
Or you could always get another PS3 if you want gaming in both rooms.







