Jumping on a personal hobby horse here. When there's nobody else in the circuit, I fly military style constant aspect circuits, by adjusting the bank angle and keeping the sight angle constant I know (because I tried a couple of weekends ago against a marker by the runway) that I can accurately make a touchdown point within 10ft, or 20ft if I want to guarantee a soft landing (okay, yes I have plenty of hours, about 130 of which are in this particular aeroplane).
Sideslipping can be eliminated or kept to the last few feet.
Rectangular circuits, in my opinion, do not lend themselves to hitting accurately a touchdown point, particularly if you can't use power to adjust the descent rate (which I prefer not to - I tend to do glide approaches unless there's a good reason not to).
John Stewart Smith (the until recently editor of Flight Safety Bulletin) wrote a piece on the subject in FSB a year or so ago which I agreed with absolutely.
G