Richard,
Either airplane has the Lycoming engine and believe that they are 1800 to 2000 hours TBO (time between overhaul). Now, some make it to TBO, some come up short and some run 1000 hours over TBO. Just depends on care and maintenance.
Regarding your comment regarding higher maintenance and running costs. The Citab is probably a bit lower than the Cessna on costs. Can almost guarantee that the running costs on the Citab are less than a Cessna as they are lighter thus use less fuel.
Also, did you know that certain models of airplanes (the Citab and C-172 included) are certified to run on car fuel? It requires a STC (supplimental type certificate) but cuts your costs by 50% in places.
http://www.autofuelstc.com/autofuelstc/pa/ApprovedAirframes.html
http://www.autofuelstc.com/autofuelstc/pa/ApprovedEngines.html
The Citab is type certified under the "Champion" name, and uses a Lyc 0-320 engine I believe. Cessna under Cessna and uses a 0-320 engine. Have used a mix of car and aviation fuel for years now with no problems.
Either airplane really needs a hangar in that part of the world, but if you had to leave it outside the Cessna might make it. A minimum for me would be wing and tail covers, which are a bear to remove in the snow and such.
Dantilla makes a good recommendation of finding one to share with someone. I would try to find someone who has a Citabria or Cessna and already in a hangar in the area. You are not using it to fly on a regular basis but for fun so that would make it easier to schedule between 2-3 owners. I own my own airplane and could just as easily share it with one or two other owners, just have not needed to fuss with it. Your starting out might be alot easier in a partnership.
If you want more detailed info or some contacts in the area, PM or email me.