Getting from a great design for a web site to a great web site is a long road paved with technologies and promises.  I like the KISS principle when it comes to this.  If the technology is so complicated that you have to hire people who only specialize in that technology from companies who the vendor certifies, you "could" run over budget ;-).  If you stick to tried and true technologies, you may have to work a little harder to make it do what the latest technology company promises - but at least you know how long it will take and how much it will cost.

More to come...