Depends on what you want to accomplish. If you want to upgrade the transmission to the 02-05 design then there are 14 parts needed to do the conversion and they will run 450-500 bones from Yamaha, you'll also need a hydraulic press to remove/press on the reverse gear on the driven shaft.
You can find complete 02-05 transmissions for around 250 on fleabay complete, that is the best way to go but does come with the risk of buying used parts. Be sure to get the center shift for if you buy an 02-05 tranny, it is different than the one you have now, the left and right shift forks you have now will work on an 02-05 tranny.
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