which macbook should i buy on ebay? any models to avoid?

i need buy used macbook. i've done little research , found should avoid 2007 , 2008 mbp models nvidia. nvidia issue affect regular macbooks made same years? there macbook models don't have issues should focus on? advice appreciated.

 

i'd tempted avoid 2009 white 1 because of bulging issues @ bottom battery , palm rest splitting issues.

 

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