Sounds good. I'll probably go with UT2. And anti-UT2 zealots want to have one last go?

While I'm not a MTX zealot or whatever, but I gotta say that UT2 isn't more versatile than MTX. If anything, MTX is one of the most versatile programs I know. The time machine utility especially is very nice. However, the versaility of MTX isn't even really necessary, for you don't really need to do anything about it to get what you want. That's the reason I prefer it to UT2: it gives you filled skies with a great variety of both airlines and planes right out of the box. No need to add anything or change anything like with UT2. Frames also don't seem to be that much better for UT2 than for MTX.

I don't think anybody's mentioned TrafficX. Is that any good?

I was all set to buy UT2, when TrafficX appeared on sale at a low price recently. So, I decided to give it a go.Can't say I'm disappointed, it seems to work fine, models look good, and the variety of AI is extremely high. Can't compare it to UT2, but it seems good to me. I previously used WOAI which is good, but I simply didn't feel like all the effort needed to get it running in FSX.