What keyboard should we get for iOS8?

So, y'all in Android land have had 3rd party keyboards forever and given us all much prodding and teasing about not having the option over on iOS.

So, now that ol grandad is finally catching up with his zimmer frame...

Which is the best keyboard, accuracy, speed, one handed-ness, touch typing (not looking at screen), correcting with a clever dictionary that knows names in your address book and the words that are already on the page you are typing into?

Stuff like that. Is there anything stand out that we should at least have a look at when iOS8 launches?