Interesting stuff. I wish Donncha would join in and tell us his reasoning, it would help :)
I will run some testing later tonight on different options for these two rules and will write back here later.
HTTP:profile, x-wap-profile -- these are imho redundant. The first I couldn't find anything about; the second is relevant for WAP phones. Unless your website has a WAP version, I don't get the point of it. If someone accesses my site with a WAP browser, if he's even able to load it, then why shouldn't it be cached :)