Well, the thing is that you should only buy IXO planes that you are sure that no other companies will make... cause they arn't that detailed. der!
Pay around $20 for their unique japanese and russian planes is worth it for me. I got the Ki-84 and N1J, they are good for IXO quality, but just can't compare with Corgi, Dragon and HM, and i had to mod them to make them look better.
He-219 is pretty ordinary as well... -_-