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>I'd like to show balance in red when negative.
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>I'll check with project manager first.

The thread you linked to includes part of the answer - if you don't want parens, create your own filter. Yeah, it'd be nice if this was easier to configure.

For setting it to red, look at ng-class. Create a CSS style with the colors you want. I'd wrap the {{}} stuff in something like a span tag. Add the ng-class attribute to the span and use an expression to set the class to your CSS class, something like this might work (remove the extra space I needed to add to the span tags to get this to appear here):

< span ng-class="{'negative' : currentAccount.totalBalance < 0}">{{currentAccount.totalBalance}}< /span>