There are a lot of folks that have used a cone filter....mostly for looks or convenience when they modified their bike and wanted to remove the air box and battery to get a more open look.

I am not sure anyone has proven you will get a performance boost by eliminating the stock air box and running just "any" cone filter.  Cone filters don't provide a laminar flow to the carb inlet, the small ones may be more restrictive than your K&N, some cone filters block the vent in the top of the carb inlet and make the engine run horrible, and they offer no protection from getting water into the carb during foul weather or when washing the bike.  The stock air box - with or without the K&N may be able to provide all the air that the stock engine needs.

However - if you want to pursue this endeavor it is recommended that you not put the cone filter directly on the carb spigot - having a tube similar to the stock boot between the cone filter and carb is recommended, as it helps provide laminar flow and smooth out the pulses.

If you are not changing the "look" of your bike - perhaps you should follow this thread on modifying the stock air box for more flow.
http://suzukisavage.com/cgi-bin/YaBB.pl?num=1523302904/0
 

Sure would be nice if somebody would do a flow test on the stock airbox, and various cone filters (including the one RYCA uses).

That would confirm if there are any flow improvements from using a cone filter. (Understanding that only time you are going to experience the increase is under full throttle/high rpm use, as partial throttle cruising doesn't use a lot of air).