It seems the consensus here is that Reflex XTR is very expensive but doesn't have the best physics model. RFG2 shares this problem according to most of the posts I've seen on the subject, but the graphics aren't wuite as good. G3 is supposed to be the best of both worlds with many new features (read: "eye candy"). AeroFly Pro seems to be the current (as in, available right this minute) defacto standard for the best compromise between graphics and excellent flight physics, which might be of interest if your focus is 3-D in particular. I've only used G2 so far, but will probably buy AFP based on the recommendations of the people on RCU. G3 is too expensive for what it does, as far as I'm concerned. Just my $0.02.