I too think the email clients are extremely limited. I think touchdown was the best for me with Exchange. I like K-9 for POP style accounts. I have come to the conclusion that there is nothing in the pipeline for email on any platform that is as good as a Blackberry mail client. I still think they would do well to make a version for Android and sell it as a service etc.
Sorry I didnt really offer you anything other than confrmation of your tests.