B5 Season 2 is tempting, since that would be a lot of fun to watch again. Season 1 would also be fun to rewatch... DS9 season 1 will probably be the last thing I buy, eventually, when it’s time to finish up my collection for completeness’ sake. No, wait. B5 season 5 will come after that, possibly at the infinity point. But anyway, the other option that comes up is DS9 Season 2 or 3... since it’s been a long, long time since those were on TV, and I’m not sure I remember what happens in them. It could be nice to see them again, for the first time. Some of that time I may not even have been watching, and it could really be episodes I’d be seeing for The First Time!
Hmm... More thought must go into this.