you can download the free helis for realflight from the knifesegde forums that people make (its the core models that is needed though to be able to use them and they cost money for some reason) so far the only unrealistic model i got was for the mcpx  but the rest seem ok. having used both phoenix and real flight 5.5  i have to say the graphics on phoenix slams realflight  but both get the job done. i have used the  free trial of clearview also and it seems to be fine  so i guess what ever your budget permits.