Help with Gamestop

I can't make up my mind of whether or not to trade in DJ Hero, Mass Effect 2, and Bioshock 2.

I've looked up the trade-in values for all games and I'll roughly get about 160$ for them.

With that 160$, I'm going to buy Final Fantasy 13 and BF:BC2

I'm asking you guys, is it worth it?

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