You could probably make that decision with or without the GST. If you felt you needed to buy a cash register in order to run your business, then you could do that now, but certainly you would be able to do it as part of the GST conversion as well. There are no special provisions because of the GST change, so if it's allowable now, it will be allowable on July 1.
On May 8th, 2006. See this statement in context.