RB,
Check out
www.transair.co.uk
They have some decent, "serious" simulators/packages for IR etc... I believe they also sell 'Elite' which Mr.Wallup mentioned. As already stated, some of the more professional S/W is a tad pricey (To be expected I suppose), but may well be worth the investment. Can't offer any more advice on the matter because I have never used such S/W, and am far from IR !!! Only going by what I've read and seen advertised.....
NB.