I checked the price for starters at Advance Auto Parts for a 1998 Subaru 2.5 RS and came up with:
Automatic: Part Number: Worldwide 17292
Remanufactured; Mitsubishi Type; Permanet Magnet Planetary Gear Reduction; Automatic Transmission$174.99.
5-speed: Part Number Worldwide 17290
Remanufactured; Mitsubishi Type; Permanet Magnet Planetary Gear Reduction; Manual Transmission $137.99.
Hopefully this gives you starting point on how much you might spend.
http://www.partsamerica.com/SelectPa...rchFor=Starter
-Charles-