potshr - 8:43 am on Dec 19, 2011 (gmt 0) [edited by: engine at 10:17 am (utc) on Dec 19, 2011]
for username: having a '-' in between the username though will be better plus also gives you an advantage over the other in remembering, however to rely much on the name of the page should not make much difference in searches in comparison to the other modes of SEO.
To chose the name of the page please try to chose a more elaborate name of the page without hyphons which is more understandable for human users, search engine robots will adjust themselves if not.
[edit reason] self promo [/edit]
[edited by: engine at 10:17 am (utc) on Dec 19, 2011]