Join Date: Aug 2012
Location: Colorado Springs
Bikes: Borealis Echo, Ground Up Designs Ti Cross bike, Xtracycle, GT mod trials bike, pixie race machine
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Your best bet is to ride it a bit after replacing the tire and decide from there. If you feel there is an issue with the shifting spend the money to fix that, if the brakes are not to your liking you can invest the money there, etc.
Generally the first things people change out are the contact points like grips, saddle, pedals for something that suits them best.