Scope advice for my AR-15?

I'm going to buy a scope for my new AR-15 (probably an NcStar Mark III Tactical Scope OR a UTG compact CQB Scope). My problem is the front A-bar sight is in the way of a scope. Should I buy a build-up for the scope (to raise it above the front sight)? Or should I remove the front sight and attach a folding... show more I'm going to buy a scope for my new AR-15 (probably an NcStar Mark III Tactical Scope OR a UTG compact CQB Scope).
My problem is the front A-bar sight is in the way of a scope. Should I buy a build-up for the scope (to raise it above the front sight)? Or should I remove the front sight and attach a folding MagPul sight?
Thanks in advance for any advice you may have!
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