I have almost all of the games on this list, and think overall it's a great list of Cube games.
If I were to add a few to this list:
Waverace : Blue Storm : $4.99 Gamestop (Though similar to Waverave 64, still a great time)
Extreme G3 Racing : :$2.99 Gamestop (A hybrid of F-Zero & Wipeout, with added features like weather conditions, breaking the sound barrier, great physics and speed. A little short to be honest, but for $3, a true bargain.)
Batallion Wars : $6.99 Gamestop (A brilliantly fun tactical challenge)
And a few great titles that are a little pricey, but worth the money:
Alien Hominid $13.49 Amazon (Old School Contra Style Skill Level Required!!)
Beyond Good & Evil $47.00 Amazon (Wow)
Pikmin 2 : Thanks to Brawl, this is now ridiculously priced everywhere!
Ikaruga $36.95 Amazon (The most challenging top scrolling shooter I've ever played)
Metal Gear Solid : Twin Snakes $29.99 Gamestop (The BEST version of the original MGS)
Wii Code 3456 7941 4060 2924