1 EC2 instance per website - manage multiple websites on Amazon cloud using EC2

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http://serverfault.com – I'm managing multiple websites, most based on WordPress and all are based on LAMP stack. I'm moving all my websites to Amazon cloud. I'm new to AWS and my plan is moving 1 website by one, starting with my smallest website. My question is should I put all my site on 1 EC2 instance and or 1 website on 1 separate instance? This probably sounds stupid since anyone would definitely choose the latter in conventional web hosting context. The reason why I had a thought for the former are: Reusable LAMP stack Can I generate an AMI of my own with LAMP stack ready to use so that I can reused i (HowTos)