Something VERY IMPORTANT to be aware of...
You are going to "start fresh" and create a BRAND NEW account on the NEW iMac... is this correct?
If so, be aware that you could encounter "permissions problems" if you just drag stuff over from your cloned backup. The new iMac won't recognize your old account "as yours", even though it may have the same name and password. If you try to open some files, you may get an alert that you don't have permission to do so.
THERE'S AN EASY WORKAROUND FOR THIS.
Do this:
1. When you connect the SD cloned backup for the very first time, let its icon mount on the desktop but don't open it yet.
2. Click ONE TIME on the icon to select it
3. Type "command-i" (eye) to bring up the get info box
4. At the bottom of get info, click the lock and enter your password (the password for your NEW iMac)
5. In "sharing and permissions" put a check into "ignore ownership on this volume"
6. Close get info.
You can now copy from the backup (i.e., "from the old Mac") to the new iMac, and anything you copy will "come under the ownership" of your NEW account.
Something else to be aware of:
When it comes to copying stuff from your old home folder to the new one...
BE AWARE that you CANNOT COPY the "first level of subfolders" (the folders name documents, movies, music, pictures, etc.).
However ... you CAN COPY things that are INSIDE OF these folders, such as your iTunes music folder, the pictures folder, loose items, etc.
It's a little more work doing all this "manually", but not particularly difficult.
A good idea would be to keep a pencil and paper and write down what you've migrated, to keep track of things.