I want to move my instance to a micro instance to a small instance but when I try to launch a new AMI based on my Micro instance AMI it only gives me the option for 64 bit instances.

My initial ami is based off an ubuntu 10.04 image.

Is it not possible to move between 64 bit and 32 bit instance?

Would it be possible to use a load balancer to have a 32bit instance and a 64bit instance work together?

I have a website/web app that I will be uploading huge volumes of data to. I will be starting with 65gigs of images and then moving up to 100+ gigs of images.

I am not sure which instance type would be best for this. I was going to use a load balancer and auto scaling to increase the number of instance when the load is high.

Also when using a load balancer, does one of the AMI instance become the primary image and the rest act as clones of it?