Question about buying SSBB

[Sol]

I'd say trade in Twilight Princess. It really doesn't have any replay value, whereas Super Mario Galaxy does, (although admittedly it gets stale quicker than I'd like) and Super Paper Mario might..? (I haven't played it.) I mean, you won't really get anything new out of playing through Twilight Princess again. It didn't have an extra playthrough like Wind Waker or anything, which disappointed me. Not only that, but it's the oldest out of those three games, so if you ever wanted to buy it back, its price would probably be the lowest.