Audio Technica HE61...Audix OM5...Most of these will all be different flavors in comparison to what you've already tried.

i personally like the 57 for clean strong crisp, slightly agressive "in ya face vocs" specially rock, i know it's an standard mic, but used right... for me it works...

Like Davedogg, I would recommend (highly) the audix om2, and om5

I bought two om2's not long ago, and they are very good.

I've been using them on Vox, snare, and percussion, and I'm as happy if not happier than using an SM57. Different flavour, less harsh in general, a bit more true to the source perhaps? Which isn't always what you want :)

My absolute favorite is an Audix OM7, needs very little to sound great.
8-)

i like the Beta 57 and the Beta 58.... For certain vocals for me its tough to beat a beta 58......especially when the singer insists on hanging on to the mic....

I have a KMS-105 that I like

In Live/PA situations, I am loving the Beyerdynamic TGX-60 more and more each day.
The KMS-105 is also nice, but its a condenser.