Imo the RSi's are nothing special and some of the clubs are a bit irratic, like the PW, 8i, and 3i. I scored nearly as well with my level 64 Nikes as my Rsi's. Sure tee box had some to do with it but still........
I can't speak for the 97's because I skipped them but I can say w/out question that the level 100's absolutely destroy the rsi's. I'm easily scoring 12-20 feet closer per Ready Go CTTH round with the 100's.
To throw out there, the 100's and Rsi' both have the same spin rating but that's a misleading stat. The 100's definitely provide more spin. If the 97's are similar I can't see any reason why you shouldn't wait til level 97.
Good luck ;)