If you haven't played these games, buy one of these!
I've been a fan of every Bit.Trip game, and while I have my preference (Runner, duh), each game is filled with quality. That's why, especially for the folks who haven't experienced these games before, Bit.Trip Saga and Bit.Trip Complete look awesome.
Not only do they have each game, they also have their own little bonuses. Saga, which is on 3DS, comes in full stereoscopic 3D. And its portable. Okay, so the bonuses for the 3DS version aren't amazing, but the games are still really good, and the $40 is right for a collection of all six games.
Bit.Trip Complete on Wii, however, is packed with new content. There are 20 new challenges for each game (120 total), an audio gallery with everything ranging from fan remixes to the original songs, an image gallery, a video gallery that tells the story of Commander Video, new difficulty modes, online leaderboards, a CD, and six letters written by Gaijin Games' Alex Neuse to Bit.Trip fans. Simply put, there is a lot of shit in this game.
Really, if you've never played these games before and you were interested in them, I highly recommend you check one of these packages out. Or just cherry-pick Bit.Trip Runner off of WiiWare because it is the best game in the series. I don't mean to decry the other five games in the series, but Bit.Trip Runner is one of my favorite games in the past 10 years. Hell, I'd say you should go buy Bit.Trip Runner on WiiWare AND THEN buy one of these games when they come out.

Bit.Trip Saga (3DS) and Bit.Trip Complete (Wii), published by Aksys Games and developed by Gaijin Games, come out on September 13. I was personally on the fence about getting one of these games before writing this, and after writing up about all the extra stuff in Complete, I went to Amazon to pre-order it, but then realized I'll be on my honeymoon when it comes out. Someone else should pre-order this in my stead, and send me colorful e-mails telling me how much I'm missing out and how the new levels of Runner are mind-blowing. Don't worry, I'll stop referencing my impending marriage after I stop writing about games coming out in early September. There might be something like one or two more games tops where I'll mention it.