#1
How much would it cost for me to buy an Ibanez Sz 720 ($645) and add GOOD locking tuners, and DiMarzio pickups?

Approximately...
#2
The Ibanez should come with the locking tuners. If not, probably close to 100$.
DiMarzios are best of the best. You're looking at $1000+.
I'm looking to get DiMarzio's myself...
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