I'm looking to do the same thing, but have been dragging my feet due to pricing it out.
found this gem:
http://www.scribd.com/doc/3565549/Motorcycle-fork-tube-sizesit is a document that has the fork tube diameter for a lot of bikes, though without looking hard the newest bike i saw on there was an '04.
it lists the savage as:
38 Suzuki LS-650 FG/PG/FH/PH/PJ (86-88)
38 Suzuki LS-650 PS/PT/PV/PW/PX/PY/PK1/PK2/PK3 "Savage" (95-03)
the important part is that it lists all the OTHER bikes with the same fork diameter, which in theory (and correct me if i'm wrong since i've never attempted what i'm about to suggest) means that you can swap any of the bikes' lower front ends on and it should fit.
this gives you a few more options when it comes to looking for mag wheels rather than just the GS series. maybe a few of these other bikes have dual rotors too.
though, please, someone a bit more versed in forks ring in and tell me if i'm right or wrong. i'm just kind of winging this and hoping it floats on my hopes and dreams.