Welcome to the forum Tophat, as has previously been mentioned, there is little to choose between the two cars in terms of cost, it is a no brainer really, the noise the V6 makes with a decent exhaust and induction kit is addictive. My V6 will return 35-36 mpg on a run which is more than enough for me.
I have a C70 Volvo as a daily driver which is a lot quicker that the Cougar but I only have "the grin" when driving the Cougar and I am always pleased to get back into it
You have plenty of members located around you so you will never be without offers of help or advice, everything you need to know about the Cougar and how to fix problems is here in the subscriber section.
Best of luck with your hunt, with patience you will pick up a good one