Set-up for 70 kts down wind and never look at the ASI again.
Longbow, I would not be so abrasive as wombat13, but if you really think that setting up a PA28-180 downwind at 70kias is good practice, I am a bit worried for you.
70 is a good speed for the start of final, coming back to 65, but it's way too slow for downwind.
As a generic approach I'd plan to fly downwind at 100 coming back to 90kias, base 80-75, final 70-65.
Obviously these numbers would be amended as necessary in the circumstances prevailing at the time.
Also, I would expect to trim quite actively, especially if going to the 2nd stage of flaps from clean and then for 65 on short final.
Using these speeds, I could operate quite happily into 700m of grass, with a final approach of about 1nm, due to local considerations. So no bomber circuit necessary, yet no dawdling to baulk high performance singles or twins.
Just my thoughts.