Titanium 7.0 is a good choice for 4.0+ players who like lightweight racquet's and provide their own power. it all depends on what you like i don't know much about the Wilson hyper carbon 6.6 i know about the 6.3 that has a good amount of power behind it. but every player is different and you may need something newer. try going to a sports shop and ask for a demo or borrow one of your friends and see how you like those before string yours up. if there in good condition you can probably sell them to buy you newer and nicer racquet's that fit your style of play.