When you are choosing a game from the VC to download, do you usually pick one that you already own, or one that you enjoyed...but never actually owned? I tend to lean toward ones I never have had before...but maybe that's just me.
I say keep a 50/50 rate. Download games you never played, and mix them in with ones you own. I tend to avoid the N64 games because of their high price and space taken on the hard drive (I know it's a flash drive but it's technically a hard drive). But that won't stop me from downloading Golden Eye, Killer Instinct Gold, Star Fox 64, Wave Race, Pilot Wings 64, Turok 1, 2, Rage Wars, and maybe... maybe... Mario Party.