Gamecube List
I've lately developed a bit of a love affair with the little purple lunchbox. Its so nicely designed and was surprisingly powerful despite its compact form. It wasn't perfect, but it had some amazing hits. Unfortunately, trying to collect for it now sucks, as the aftermarket prices are insane. I'm not paying $40 for Luigi's Mansion in 2016, that's crazy.
If you poke around, you can find the weirder and more overlooked games for reasonable prices.