My suggestion to the OP is to print out a white subject like this one on each of the papers recommended in this thread and compare their color neutrality. Believe is or not, some of us hate warm paper and don't care about OBA's. If the print goes bad, I'll print another. However, I do hope they hurry up and make a baryta-infused cotton fiber paper like Shadowblade talked about.
http://www.flickr.com/photos/gemmastiles/8089691899/sizes/o/in/photostream/
Another alternative to using OBA-filled papers is to use a printer with white ink. This lets you have a cool or neutral white, even on a warm paper.
