I think you must just have a really really good sr80, before I sold them I did a lot of listening to my sr125i and my new 325is phones, and especially in terms of clarity and detail the 325's had it all over the 125's. As a matter of fact IMHO I think those two things along with bass extension are the main things the 325 does better than all the other phones in the SR lineup. I am still sorry I sold my 125's, for some stupid reason I still miss having those around.
Also what exactly is it that makes you say you wish you kept them around?
I owned 80i's before the 325's but destroyed them by accident, but I always wanted another pair for some reason, so I purchased them again, and now I guess I know the reason (for their detail and their clarity).