Wheel circumfrence variance

Howdy-

How much wheel diameter variance from stock do you guys feel comfortable with? 1"? 1.5? I've heard one inch equals about 4% error on your speedometer; I can get a really sweet deal on some tires, but the sidewall is a bit smaller than stock. It calcs out to about an inch off stock in overall wheel/tire circumfrence....is that enough to worry about if I'm cool with the speedo diff? Thanks for any opinions!
 
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