Personally, I like to use the Ivona Voice Joey, been using it for years. I use it with Balabolka Text-to-speech program. IMO, these voices sound the best, when you speed them up by 2 or 3 points. Making them talk more a normal speed, or just a bit faster.
I actually use Balabolka to read websites, and especially comments on forum, and such. I even use it to read books. The Ivona voices are just that good.
I think the voice packs are around $40. You'll get your money's worth out of them, if you use them like I do.