Buy some VC games.
I have a Wii and a decent PC, and I have a surplus of games that I haven't even managed to play yet on Steam since they are so cheap sometimes, as well as getting to enjoy all the Nintendo 1st party games that I enjoy so much. Twilight Princess takes like.......50 hours to beat so I don't know how you managed that in 4 days.
I still play Brawl to this day (well, Brawl+ technically).
I actually play it competitively as well.
For me my Wii has already been well worth the $250 I spent on it, every thing I buy for it past now just increases the value even more.
If I ever bought another console it would be a PS3 as they actually have a good number of exclusives. All the 360 has is Halo and Gears which I don't like anyways :\
I get amazing deals on Steam so I have lots of games on it, and I also play a variety of great Freeware games that I have found. Really the only game system you need is a good PC, and I would put Wii as second since it's relatively cheap and has so many exclusives/VC/Wiiware/It's easy to hack.