Are those just chips? If so all of that will go away the second the bumper is stripped. Unless the plastic is actually split I'd keep it stock... of course if you want an aftermarket body kit now's the time.
Beware though. If your shop is any good then your repainted bumper will be much flatter (no orange peel) and better looking than the rest of your car. Most people wouldn't notice things like that, but I do. Nissan paint is sh*t quality straight from the factory. 
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2009 370z #206 (all mods are Home Depot)
2009 Ducati 848 (full Ohlins, Termignoni, etc)
2003 Grand Cherokee (long arms, big tires, 4.56, lockers)
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