I am not so sure about remakes and remastered versions, specially of game that came out not so long, or are already in HD.
My idea for a Halo remake, would be HALO: The complete trilogy, with the campaign of Halo 1-3, ODST and Reach. And only 1 multiplayer game based on the most popular of the franchise (2?, 3?) with modes and maps taken from all the games. That I could buy, as it gets me almost all the plot of the saga (excluding 4th that came out not so long ago) and a fun multiplayer game to test.







