The world products roush 200's seem to be a decent head from what I can tell.
Here is a link to info on these heads. Trick Flow makes some pretty good heads also. From what I gather just reading on here and other sites, the AFR 185's are an awsome head. Pricey, but worth the extra dough, so I've been told. I have no personal experience with any aftermarket heads, but I was considering the Roush 200's for my stang. Also, check
these out. They dont seem to be too bad of a head for the money. Hope this helps.
Caymon