By using the Font Works Stack, you can add all sorts of fonts... virtually any font you want. From there you can use the built in WYSIWYG Editor for Stacks to add color, control alignment, add underlines, and even create links.
There's almost nothing you can't do, however keep in mind that not all fonts support some types of styling such as bold or italics.
Remember, you can buy one font stack that will allow YOU to decide what fonts you want or you can spend $3, $10, $20, or a lot more just to get a few font stacks that don't allow you to add fonts without having to pay more money.... afterall what's better? One stack that rules them all or a dozen stacks that barely scratch the font surface? You decide.