|The 182 is one of the most STCed aircraft out there. There are way more engine options than mentioned here and lots of other variables that you just couldn't imagine.
I would highly suggest that if you're planning on buying a cessna of any type or leasing one then become a member of of the Cessna Pilots Association.
The membership fee of $60 and will pay for itself with in 24hrs I can almost gaurentee that.
Once you become a member log into the forums for the most rich collection of Cessna information anywhere on the net.
As for engine options. There are way more than listed. PPonk, 0-520, IO-520, O-550, IO-550, IO-470, SMA Diesel, Turbo charged versions, Super Charged versions and the list goes on.
The Texas Skyways O-550 will give you a TBO of 2500hrs.
AVCanada forums are ok but for indepth Cessna informaton you can't beat the Cessna Pilots Association. BTW there is a knock of group called Cessna Owners Association don't confuse the two as the later is no where near as good a forum in my opinion.