I too will be purchasing Halo for the PC along with Doom III, Half Life 2, Knights of the Old Republic, Star Wars Galaxies, Counterstrike Condition Zero and Jedi Academy. All of them should run just dandy on my Geforce3.
On top of that i'll also be enjoying the best the Gamecube has to offer including Mario Kart Double Dash, Star Fox Armada, Resident Evil 4, Rogue Squadron III Rebel Strike, Final Fantasy Chronicles, Metriod Prime II, Pikmin II, F-Zero GX, Metal Gear Solid Twin Snakes, Soul Calibur II, Beyond Good & Evil, and Too Human. There is more where that came from but I think I got my point across with just those alone. Unlike those few vague reasons the author of this thread used to justify his losing faith in the Gamecube the ones I listed are far better examples of why I am not following suit.