I had the HQ Sweet 16 and loved it. At first it was a shorter length, but later I put on the additional length to, I think 10 ft.
I now have the HQ Avante and love it.
So, go for what you have room for knowing you don't have to have the Sweet 16 to full length.
I do have arthritis in my hands so the sit down model wouldn't have worked for me anyway.