That's a lot of $. An OEM kit including the flywheel is less than that. Most people seem to be using the OEM Exedy kits, you just have to make sure you get the right one for your trans. NASIOC was pretty helpful. Some of the kits fit, but the clutch doesn't engage right and the disc gets chewed up. You're matching everything to the trans, not the engine BTW.
Here is a good piece of info:
wrong clutch!See how easy it is to get the wrong one? Not sure if that KSB04 is correct or not, I would cross-reference it a couple of times just to be sure. You can look at the Exedy site.
Search on www.25rs.com as well. Dedicated somewhat to the 2.5RS. Search KSB04 over there and see what you find.
BTW while you're at it there is an oil separator on the engine under the flywheel that is made of plastic. There is a metal replacement now that you might want to swap out. You can get them on e-bay. Part # 11831AA210
Oh and you will also need new flywheel bolts. The ones for your flex plate are way too short. Part # 800610740