[Modern] Fun with Isochron Scepter [Discussion]

So Isochron Scepter is probably one of my favorite cards ever.  I just found out that one of my LGS's is starting to host Modern tournaments, and I want to build a competent deck to compete with.

Since I love Isochron Scepter so much, I want it to kind of be the backbone of this build.  I'm not dead set on colors, but what I have in mind is R/U so far.  I want to use the Scepters to completely control the board state through use of a toolbox of different abilities.

I've chosen R/U for my base because those colors offer good instant speed card draw, countermagic, and removal/burn (sorry, I haven't actually built the deck yet, so no decklist).  Right now, I've got cards to put on the stick like Lightning Bolt, Incinerate, Think Twice, Mana Leak, and Negate.

So here is the discussion, what are some amazing spells to put into a scepter?  I don't care if they're off color, as I don't intend to hardcast most of them.  I know Lightning Helix looks really good, and a lot of the RtR block charms seem pretty effective, but there has got to be some awesome stuff that I'm not thinking of.  Thanks for taking the time to read this mess, and I look forward to your suggestions!