Personally I wouldn't go for the 928.
I would. They're a brilliant car and of the people I've met who have an opinion on them they usually fall in to two camps. Those who have never driven them (or only briefly), usually have a bad opinion of them, but never a concrete reason as to why. And then there are those who have some experience of them, and they all, to a person, rave about the car.
There are so many reasons why the 928 is a great car, and I could write a novel about it, but I'll try and keep it brief. My Dad owns a 928 and I had an article published in a NZ magazine comparing a 928S with a 911SC on the track, so I have some experience with these cars.
If you want to, you can just cruise in a 928. It's a very comfortable car with leather everywhere (including the headlining!) and a very torquey V8. But like an Alfa V6 on steroids, the engine REALLY comes on song over 4000 rpm. Once you've revved it hard through a tunnel, you'll be looking for the opportunity again and again and again.....
The 928 is a heavy car, and you'll always be aware of that fact. But the weight is very low down, and because it has a transaxle it is very well balanced. Like a GTV6. I've had one well out of shape on the track and it's very easy to correct and get it back under control. The handling is very neutral and the steering is the second most communicative powered system I've experienced after my 90 (that's not a joke by the way, the 90/75 steering is sublime. Second only to early 911s in overall feel, and the 911 is not power assisted. This is only in my experience.)
Unlike a 911, or an early Alfa, you really can decide how you want to drive, ie relaxed or committed, and the 928 will reward either state of mind.
They're still a fast car. 1980 928S 0-60mph in 6.2 seconds (manual), 7.2 (auto). They only got faster with the S2, S4, GT, GTS etc.
Still the only sports car to win the European Car of the Year (1978)
When they were released EVERY Porsche works driver had one as a company car, over a 911 or 911 Turbo.
Dirt cheap nowadays (but don't even think of buying one that doesn't have a good service record. Or a pre-S, they weren't very good).
They really are a great car, and a real classic car bargain at the moment. One of my favourite all time GTs.
Someone had a standard S4, on road tyres, at Sandown earlier this year while his racecar was out of action, and (while being careful) it was doing 36s, so they're a pretty quick car.
Hope this confuses things
Cheers
Sheldon