The school I'm at has a couple of Teknam Sportstar LSA's that are proving very popular as primary trainers. $95 an hour wet. For fatties, 172's range from about $135 all the way up to $180 depending on age, engine and equipment. I'm training on Diamond DA-40's having transitioned from DA-20's after the two Katana's both cooked their engines in short order. The school is replacing them with more Sportstars so the boss offered me a discount on the DA40's to compensate for the extra hours transitioning. TBH, its worked out well - G1000 and variable pitch prop experience is no bad thing.
Anyway, to get to my point, assume you'll need the average of 60 hours of flight time, at least half of which will be dual (so add $100 per hour for the instructor). Add ground school, books, headsets, and check ride and I'm thinking $12k minimum, possibly rising to $15k depending on what aircraft you fly.