I've heard many times here that the 3.0 experience is more "raw" and just seems quicker and more lively. If true, it sure sounds like it would be worth the price of admission.
However, the CIS systems in the 3.0 seem kinda finicky to me, having read many discussions about them here over the last 2 years....what with fuel pressure and vacuum playing crucial parts to keep them running tip-top. Also, throw in other factors like the WUR as well as other valves and regulators, and it seems like you have to be really on top of it to keep them going good.
I'm sure a lot of hardcore CIS guys will call BS on what I say, and they're probably right. These guys really like CIS and will tell you that once you get used to it, the CIS is a really fun and reliable setup.
But I'm a "plug and play" kind of guy. That's why I prefer the DME in the 3.2. There's reference sensors and CHT sensors and a couple of switches and such, but the system just seems simpler and more reliable IMHO.
So, I guess it really all depends on how "raw" you want your experience to be. After all, when it really comes down to it all, the cars are essentially very similar from it's earliest roots.
just my .02 cents.