W
just use your judgement to decide what is the best in each category of IM that you think should be in it
Then I would go to them all at the same time and let them know who else is going to be involved and if 1 says no go to your second choice in that arena.
I did that before for a business building seminar and I went to the top guys and when you use the other guys names you gain credibility instantly and you also get on the inside track with them sometimes. It would help if you can get a definate from one of the big names before you go to the others.
maybe someone here can help out.
some suggestions for areas to cover:-
CPA
adwords
ebay
keywords
autoresponder
graphics
video posting
SEO
membership site software
hope that helps
os....