Question about Oblivion

[chuckbomb]

So through some serious retardation, I managed to scratch the hell out of my Oblivion (xbox) disc, which I bought yesterday. I bought the Game of the Year edition, which costs $60, rather than than the $30 of the normal game.

So here's my question:

Is there an appreciable gameplay difference between normal and GotY edition? I still have the second disc, so I can presumably play the expansion packs (though I don't know if these would work with the "normal" edition's gameplay disc).

Anyway, should I buy the normal game or splurge and rebuy the game of the year edition?