If it is the 62/68 S300 "phatshaft" I would stick with what you have bud. Those drive extremely well with the mods that you have. If it is the 71mm turbine or the 74mm turbine then it would be an upgrade in the spool department. Then you have to weigh having me convert it to a 68mm turbine vs buying a whole new turbo. Upgrading what you have to a more driver friendly turbine wheel (if you have one of the larger turbines) is money well spent IMO in a lot of cases.
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2015 half ton heavy chevy
81 Fairmont LS project
Many yard ornament projects...
North American Turbo
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