HTML5 Video Ads Integration

I already run an in-house HTML5 video player and have an active Google Ad Manager account waiting for traffic. What I now need is the full plumbing that lets pre-roll, mid-roll, and post-roll VAST ads... (Budget: £20 - £250 GBP, Jobs: Google Ads, Google Adsense, HTML5, JavaScript, jQuery / Prototype, Mobile Development, PHP, Video Ads)