Please, do not get a cetme.
Main choices
PTR-91
FN/FAL
M1A
I dont think you can go wrong with any of them.
The main difference is the PTR-91 and the FN/FAL does not have an exposed bolt and no forward assist. If the bolt does not close, you have to rack the charging handle again.
Related thread -
http://www.perfectunion.com/vb/rifles-misc/85080-ptr-91-vs-fn-fal.html
Remington 750 Woodsmaster - If all you want it a 308 semi-auto rifle, have you looked at the Remington 750 Woodsmaster?
I think the 750 has a 5 round magazine, has either a wood or synthetic stock, semi-auto.
The 750 woodsmaster is going to cost a lot less then a military grade 308 rifle.
Check out this thread -
best 308 rifle for the money
If your choices are between the DPMS AR-10, CETME or PTR-91, I would go with the PTR-91.
Out of the rifles you listed, the PTR-91 probably has the lowest cost of ownership. You can pick magazines up for like $1 each.