Do you think it's worth wild to buy another xbox or just upgrade my PC?

So I haven't been on xbox live for almost 3 years, and recently I've sold two of my fat xbox 360 because they were getting old, so I decided to sell them to make some money. Now I have $400 so do you think should get a xbox slim and couple of new games like halo reach, odst, mainly xbox exclusives because in those three years I've been doing PC gaming so no shortage of games there. The other thing I'm planning on do is buy windows 7 ultimate and maybe a few upgrades to my PC and buy couple of PC games. Buying a PS3 is not an option because I don't like the controller and I already have a great PC that could do everything a PS3 can (i.e play blu-ray, and game). I already own a wii too. So what would you recommend and why? it's either get an xbox slim or just stay gaming on PC and just do few upgrades.