I now recommend iCab. I started to find Atomic constantly crashing with several tabs open. That same tab arrangement poses no issues for iCab. And it has just as many custom gestures, Dropbox saving, saving inside the app, integration with other applications, etc.
Also, iCab seems to have much better developer support than Atomic. I don't think Atomic has been updated since...December? iCab has had 5 or 6 updates between December and now...and it shows. Better interface, better stability, just about all of the same features, and some that are even nicer.
If Atomic gets a proper update, I think this conversation can be reviewed again...but as of right now, I've tried/own:
Safari
Dolphin
Atomic
iCab
iCab is best of the group. I am only sad that I can't change iCab to my default browser. I'm not a fan of everything opening in Safari, and only jailbroken devices can change the default browser.