Not to rub it in, but I'm finding Variaudio great.
It might be worth your while upgrading to 8 Pro rather than looking to third party pitch correction software like Melodyne. Having such functionality built in makes it easier to use, plus there are loads of other features that are Cubase Pro only you might find yourself needing in future.
To be fair it's not something one should necessarily expect outwith a flagship version of a DAW. Studio One for example only comes with Melodyne Essential in the Pro version.