This weekend, I'm going to be playing in a DC only tournament. Rules are, bring 100pts to add to a sealed starter. Using your 100pts and starter, build a 300pt team. So, my question is, what should a bring for my 100pts? Should I go with cheap support figs like Harley Quinn for perplex and Man Bat for cheap flight? Or should I bring one powerhouse fig such as E Batman?

Thanks for your suggestions.

I've found in sealed events, a single flyer can make or break a team. I'd pack exp. Booster Gold, rookie Hawkman, and maybe a T.O.Morrow. Your odds of drawing a bruiser (Bane, Swamp Thing, Grundy) aren't too bad.

Webhead nailed it.
Bring the support that you want for your team. What will the build total be? 200 total, or 200 + the 100 you bring?
Eitherway, bring what you'll want to support your team, Taxis, perplex, a shooter, whatever you must have for your team and don't want to leave to chance. (though mostly fliers)

I'd pack E Booster Gold, hands down the best taxi ever! (dont even try to say he isnt). An outwitter and a medic - Desaad could be a good choice as he has both?! Still leaves about 15 points...

Take V Steel (he can taxi and he's a killer piece!) and either a V checkmate medic or V robin.

... or you could use a 100 pt Sinestro. Everyone would probably focus on him, leaving your other 200 points from the booster to beat the snot out of everyone!