Well, first off when you look at any mount it should look real!!!!

I would suggest going to the other taxidermist shops and just take a look at there work, if you can tell the difference between your $250 and the $400 mount, which you should, then at that time you an make your desicion. Are you proud to have it hanging in your house or is it something that will get stuck hanging in the garage?
I know a few people that went with the cheap guy because they couldn't tell the difference either, that is until they had a qualitymount done that was hanging on the wall next to it. As soon as they hung it on the wall they could pick out the differences between the two mounts.
With that said it is your money, and you have to see it hanging on the wall day after day.