There are a ton of great note-taking apps out there for the iPad at this point (one of my favorites is Penultimate), and because there are so many available, choosing one is really up to personal preference at this point. Rich Notes is a relatively new entry to the pantheon, but it's free (which is always nice), and will let you take fully formatted notes on your iPad you like. The app is simple and clean, and features full text formatting (bold, italic, and underline to start), iCloud compatibility, the ability to share your notes out via email or copy them to the clipboard, and a nice wide landscape orientation editor for typing into.
The one real issue I have with Rich Notes is the fact that much of the app's really shiny formatting options (like the ability to use strikethrough text, change the text's color, or use highlighting) are hidden behind in-app purchases. That you have to buy these features isn't so bad (obviously the app's developer worked hard, and deserves to be paid for his work), but the buttons for these features are permanently in the interface, and you are only reminded that you need to purchase them once you've gone through, selected your text, and then hit the "highlight" button, for example. That can be frustrating, especially when you're in the middle of taking notes fast and want to highlight something without remembering that you haven't made the in-app purchase yet.
So it would be nice if the IAP features were a little more well-thought out. Obviously, buying the features means you won't have any problems, but the model is just a little weird (especially because, from what I've seen, many purchasers of productivity apps are more than happy to pay for a well-made experience). At any rate, if you want another notes app to try out, Rich Notes is currently available as a free download on the App Store. I doubt it will sway you away from a solution if you've already found something you love, but again, finding a notes app you like at this point is mostly a matter of personal taste. So in that light, it's probably worth a try.