Used to do simple Be'er Mayim only, after trying some bubly and polar flavored seltzer I concluded there's a place for them at times as well.
How about Schweppes? It's been a long time since I had any, but I remember liking them.
Edit: (Correction: I may have had some more recently than I thought - I've just realized
I haven't been paying any attention to the brand of the seltzer cans I've been drinking.)