i also have a miyata 610 and had a similar dilemma. i ended up using a NOS blackburn rear rack i scored for very inexpensive as a front rack. mostly because of cost and versatility. nice front racks seemed to be fairly expensive and some of them can only be used with two smallish front panniers. gives me the option of mounting my two panniers up front or mounting two panniers in the rear and two up front if i'm doing a long solo tour. i've also hauled lots of stuff on top of the front rack for short and long distances. its been working really well so far.

http://www.flickr.com/photos/26700977@N08/4354150689/