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In inches, what is your current saddle to bar drop?

flip your stem and/or get road drops.

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are you pretty dead set on getting flat bars or risers? bullhorns seem to work well for city riding...lots of hand positions and it's easier to mash up hills.

you can get OS bullhorns or riser bars fairly easily. bullhorns with a positive rise stem look rather awkward, however.

Taller stem or mustache bars.

+1, beat me to it.

The issue might be your 2-3" of drop (certainty) and your fit in general (for instance if your reach is too long or too short.)

Like other people mentioned, raise your hand position first and then make sure your reach is appopriate. The fit calculator at competitivecyclist.com is a good starting point.