Why Can I Not Use m1.small And m1.medium Instances With By EBS Boot Image On Amazon AWS?

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http://serverfault.com – I modified an alestic ubuntu image on a t1.micro sized instance, saved the EBS boot image, and am now trying to re-start it using a slightly larger instance. The only instances available (for regular and spot requests) are: t1.micro m1.large etc... Why can I not start an m1.small or m1.medium sized instance? Micro instances are too weak, but a m1.large is too powerful... (HowTos)