If you end up limited to a 28" the LG LN4500 series work really well. I have one in my multi-cab which has a PC and Blitz/Showtime board with Gonbes 8200, it works great when set to medium resolution.
The fact that these are lower resolution actually makes them look better with the older games vs using a 1080p native display. I actually used a high end 1200p display initially and the lower res LN4500 looks better.
I know a local guy that uses dual 26" models in his RtR sit downs and he loves them, says they are even better for those particular games than the crt's.
Best of luck,
Jason