If you do or don't know the vocaloid Ruby developed by Power FX (the same developers of Sweet Ann, YOHIOloid, Big Al, & Oliver) released their newest english vocaloid, Ruby. To date she's on par with Cyber Diva aka VY3 in terms of understand ability. I recently bought her download as her boxed version isn't available yet but i can guarantee she's worth the purchase. Ruby is $99.95 for download currently and is available here:

powerfx.com