Pre Buy Inspection Tips

[Skywalker]

Hello Guys
After lot of thoughts, and comparisons between C-P337 C 340 ,C 414A,decided to stick to my first plan of Skymaster,
i got distracted a bit ,as i learned C -P337, is not a good performer in icing ,but learned most light and specially the Pistons aircrafts even with FIKI ,also do not shine in this regime,so if icing condition prevails ,stay on the ground Or take Easy Jet Flight .
the cost of maintenance on C 340 and C414 run about 20 -25 k usd/year , plus fuel hanger , insurance etc in Europe its about 800- 900 usd per hour;-((((, no justification for my .mission profile;
i have learned through this Site the maintenance costs should be around 10000 usd/year and also i do not have to pay Euro Control fees ,which are about 60 usd/hr of flying .
i have spotted two very nice P337 In Europe and
i am doing a Pre buy Inspection on one 1979 ,P337 next week in Europe and i will hire a A&P to do the inspection ,Who is very much familiar with SkyMasters, but would like to have advise from the Pilots ,users and maintenance guys who are in contact with Sky masters in real life on daily basis, what particular areas i should look for, where can be problems ?what really needs to be checked ?,any traps, troublesome areas etc?
Thanks a lot in Advance
Dennis