Anyone know of a good simulation software for the SLC 5000?

I assume you mean RSLogix 500, used to program the SLC500 range of PLCs. In which case Rockwell's own Emulator for RSLogix 500 is pretty damn good. If you do mean RSLogix 5000, used to program the Logix range of controllers, then Rockwell provide an excellent emulator for that too.

I've used the 500 simulator to program for the 5000 and have great success but I just wondered if there was a better/more current one on the market. The only command that was a little sketchy was using the OSR... I finally figured out how to transfer it into the 5000 program and make it work tho... Thnx.