FYI... any GCBC you get that is manufactured by American Champion (post 1990) will have metal spars and more than likely will have a metal belly. If memory serves, the GCBC is the only Citabria offered from ACA that comes with a metal belly (not as an option).
As far as spars go, you still really haven't addressed my question of why you need metal spars. You say you and your boss want them, but why? (curious to your reasoning)
If you have found the wood spar AD (inspection) to be pricey, you are looking in the wrong location. All the AD required is for the spar to be inspected at regular intervals (annual or 500 TIS). This AD has been out almost 10 years now and there are plenty of qualified mechanics who are familiar with the procedure that it should not be "quite pricey" There is also a fair amount of literature on the issue, including a service bulletin concerning how to inspect the wing spars (and alternative methods) that predates the AD by almost 3 years (coincides with the Scout wing spar AD).
You would have to talk to my boss for his reasoning. He has been buying and selling planes professionally for over 6 years and has been a flight instructor for a lot longer than that. He personally has owned a C150, a Decathlon, and a PA-18. In his experience newer low time models have fewer problems. I trust him on that one.
As a student i know i would rather rent a newer airplane. Even if it costs more. When i first started out i had the option of doing my private in a C150 (80 an hour) a DA-20 (109 an hour) or a DA-40 (159 an hour) I chose the DA-40 because of the newer G1000 technology and I have not regretted it since. We ended up having to sell our C150 because no one would rent it when we had 4 bran spanking new DA-20s to rent even if it saved $29 an hour.
I want a newer aircraft with metal spars because metal is stronger than wood. For me it's a safety issue. From what my boss told me, the AD requires cutting the fabric and inspecting the spars. I Just don't want to deal with that.
I realize a newer (post 1990) will have metal spars but if it's a nice older one with the metal spar upgrade then i would look at it. Unfortunately if the wings were replaced, it usually means that there was an accident of some sort.
I want something that can be put on our flight line asap. In my mind a newer one will have a decent xponder, radio, gps, already installed.
The last reason is that the older models have a 150HP engine. The newer ones have 160 HP engines. I want the extra HP for up here in the mountains.
In theory it does not really matter how much the plane costs because on paper it will make money. However I know that this is not realistic. If it breaks even over the two years and I get a couple hundred hours out of the deal, i'll be happy. Heck even if I lose $15,000 on the deal, that would be about the same price as going out to get 100 hours of tail wheel time with an instructor in a rental plane. The price range i picked works for me in that, if i could not lease the aircraft, i could take it off the full commercial insurance and still be able to afford the loan payment.
-Matt