If you plan to do this yourself, be sure to get all your parts together before starting your endeavor (just words from someone who has done this many times).
Be sure you have quality torque wrenches
Get a Service Manual (I recommend the one straight from Suzuki)
Gaskets
Suzuki Bond (1207B)
Replacement Circlips for the trans
(Recommended) Billet Shift Shafts
(Recommended) Back Cut Tranny Gear(s)
If you plan on adding more high HP mods in the future - a Billet Output shaft would be a good idea (so you don't have to crack back into the tranny again just to do this)
Also, fit a traditional automotive engine stand with some angle iron and you can mount the engine right to it. This way you can flip it upside down and work on it without taking up bench space.
Good Luck Brother!!