Yes you can put SD on a BD but it will be in BD format.
If you want uncompressed avi then you will have to burn it as data on a BD, but you wont be able to play it.
If your timeline is under 1.5 hours it will fit nicely on a DVD.
If you still want a BD, export via dynamic link to Encore and let Encore do the math.
Otherwise export to dv avi and import into Encore in a BD project. Encore will will transcode to BD format.
SD on a BD will have the same picture quality as SD on a DVD.
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