I haven't read any enthusiastic personal reviews about IHC diesels, and I agree that their steamers are generally good value if you don't mind that almost any one you pick up won't look a lot like the decalled railroad's type. They are generic.
You should be able to scout around and fine bargains for P2K and Genesis models. They are on eBay all the time, and trainworld advertises good prices.
Don't overlook modeltrainstuff.com...that is M. B. Klein, and they are a very good outfit.
-Crandell