Mondego,
If your seriously considering the Porsche you might want to read some of the forums on the net.
If it was my money,given your first 2 choices I'd take the vette,on the other hand if I want a real Porsche I'd get an older aircooled 911 or better yet a 930.
check out the cost of a new remanufactured 911 motor because if you buy a watercooled 1 and keep it you'll be purchasing a rebuild for sure!
The Vette is well except for little things pretty much bulletproof.