A.T.
My husband has a Wii, and LOVES it. He's retired military, so he's home a lot; it gives him something to do.
Recently I bought him a charger--it's a dock that the remotes go into, that recharge the batteries. Probably the best thing I could have bought, because he was going through batteries pretty quickly. It was less than $30 at Walmart.
We also got him a wireless sensor bar. Not a necessity, but it's one less cord to deal with in that area.
Another great thing he did was to join gamefly.com. It's similar to netflix, but for video games. Since the games are so expensive, he wanted to be able to try them out first, so he went with gamefly. They send him games, he tries them out, and if he wants, he can keep them--he gets to buy them used, and just keep the one he has, so he knows it isn't going to be scratched or anything. It's saved a lot of money, because he knows he likes the game before he goes out and buys it.
Hope this helps you!