Quoted from MikeS:
For me I'd rather have 2 modern Sterns. If there's one thing I've found in 15 plus years in the hobby it's that even grail games get boring in a collection after a while. I eventually end up selling all of my grails to mix it up and get something new. It's a lot smaller market when you're trying to sell a $10k plus pin and you usually have to deal with shipping which is a hassle.
Spot on. I see a lot of people selling their grail games after a short amount of time. Why? Because half the fun is in the hunt, and the other half is in the expectation is so high that the game has a big hill to climb to meet those expectations.
On the flip side, early in my "career" I picked up a Shadow and a Taxi - and they won't leave for a long time. They are too much fun, and it's been 7 years.