Don't go to O'Brian Ben, I have had the same experience back in october and they wanted $3600 for the windscreens because they have to get it from Nissan Japan (They stock anything from R31, 32, 33, Stagea but 34's). O'Brian does very very good jobs on windscreen repair if you are looking at this route.
Instant Windscreens & Tinting is the place to go, they got me the windscreen for $265. Before you get excited I have to warn you this: This windscreen is made in China but does carry an ADR approve certificate.
Or better still change your insurance company to Shannon and they will give you a free windscreen every year.
Oh if you decided to go for Instant Windscreens & Tinting make sure you go to there shop rather then the call out cars, normally the store owner/franchisee is also the repairer rather then some puck just got there certificate that drive the van. If the windscreen isn't properly activate the next thing that cracks is YOUR HEAD.