Is there any (Windows) software that will batch recode a directory structure of MP3s into an equivalent directory structure of WMA files? Preferably converting the MP3 IDv1 or v2 tag into whatever WMA uses too, so that the file info is not lost?

I have a directory structure of 3500+ mostly 192kbit/s MP3s on my desktop computer (that just fit onto my 18GB empeg) that I'd be interested in recoding into WMA at a lower bitrate for use on the empeg. i.e., I'd like to preserve the MP3s as a high-quality original source, and have room for more WMAs on the empeg once 1.1 comes out.

Also, any ideas on the equivalent sweet spot bitate for WMA to 192 for MP3? 128?