Previous to the Zed, I had an Integra DC2 for about 8years. Absolutely loved that car, and that was the reason I kept it so long. Handling was sweet, always made you smile and that engine was very addictive.
When it sold, I was looking at s2ks as a replacement but couldn't justify the crazy insurance premiums they had. Test drove a few and loved the way they felt, seemed a very natural progression from the teg.
I've had the Zed for a few months now (gt4 edition) and am enjoying more and more with time. The first thing you notice is the sheer weight of it. It is not a nimble car, but as a result feels very well planted. The handling is therefore probably the opposite end to the itr/ctr but enjoyable once you get use to it. The really enjoyable thing about the zed it the noise. That v6 (mine as aftermarket induction + exhaust) sounds immense and driving it, there seems to be more of a sense of occasion.
I think both cars are great, but for different reasons. Anyway, that's just my two pence worth. Good luck with the search mate