Nei's Claw was an optional reward at the end of TTF in Hard/Very Hard modes I believe. I never kept any of them as they could only be equipped by female characters.
Online, TTF (Towards The Future) was a lot of fun. If you had a good group then FMA (Famitsu Maximum Attack) was a incredibly fun to play also. Well, anywho, mostly I enjoyed playing the online V2 quests, though original (V1) quests where you were contracted by the military to go wipe out large groups of enemies was always a neat experience when you made it to the final area where the hordes of enemies would appear and the camera angle would change.
Offline, Mome quests!

Just kidding! he was a real pain to have to protect.
There are some really moving and intriguing offline quests that I enjoy. Waterfall Tears, From the Depths, Seek My Master, all very good quests. I think the only regret concerning Dreamcast PSO is the lack of an explanation to the very unsatisfactory conclusion to the Sue & Bernie Subplot. More storyline for these two characters please! And Black Paper, what on Ragol was up with that!?