Last October I bought a Cessna 182R 1981. I was lucky enough it came with a hangar. The plane was generally in good flying condition, though the paint was and still is in bad shape. I tracked all my expenses for the first year. I know this is generally something people are looking for...
First Year of Ownership - Cost of a Cessna 182 - Pilots of America
Cessna now says 10° on takeoff is "preferred", but in boldface type the manual says anything more than 10° is "not approved for takeoff." By contrast, my PA-32-300 is a high-powered airplane with small flaps. I know PA-32 pilots who keep 10° flap extended after takeoff all the way up to cruising altitude.
I would have dumped the old cessna switches for something else and made sure there was room for extra ones. I'm sure we could have used a larger font, but I'm pretty happy with the font size in person. While this was happening the interior was out. I started to go down the path of replacing interior parts as well.
In earlier years, when the fairings were "optional at extra cost" equipment, Cessna manuals had a footnote on the performance charts about deducting 'x' knots if fairings not installed; I don't see such a footnote in the 172N manual. Assuming an "average" 172N, I'd guess about 115 KTAS with full fairings and 110 without. YMMV. 4.