yeah, it seems to me that the 7850 and the 7870 are a little overpriced, while the 7950 is a bit under. It does have 12 dollars in shipping. The obvious choice however, is to get the 7950. It certainly outclasses the 78xx series, and for not much more money in this case.
The 7950 should MSRP around $290, while the 7850 should MSRP around $200, with the new price cuts.