Highly Realistic Wedding Composite

I have three photos ready: the venue shot that must stay exactly as it is, plus one clear head-and-shoulders picture of me and one of my wife. Your task is to erase the original couple from the venue image... (Budget: £20 - £250 GBP, Jobs: Digital Art, Graphic Design, Illustration, Image Processing, Photo Editing, Photo Retouching, Photography, Photoshop)