I have a quick question, I just put 16's on my 95 Civic. This guy told me that it would've been "safer" to move up to 15's because the weight of the rims could cause some tension on CV joints later...is this true??

no .... the only thing a heavy wheel can hinder is acceraltion and braking (not breaking) you should not listen to whomever told you that and never let him work on your car