If you go to the main site, under downloads, it suggests that you run 2.43.1L I think. That's the stablest version. If you're up for it you can also try running source code from the trunk of the latest. It'll run really slowly, but when it crashes you can at least track down and fix (and submit) problems.
Actually, if you're starting a new sim I'd sync against the trunk and run that code anyway. There's a bug I need to fix still from some code I checked in to DB2 over the weekend. Once that's checked in you can run a compiled version and if you run across crashing errors I'll try to bandaid them.
There are at least two outstanding crashing bugs in trunk that I know about, but hopefully you won't hit them