F5 LTM Sizing - sharepoint skype exchange with ssl passthrough

Hey guys, short question.

 

I am actually thinking about the sizing of a pair of F5 LTMs for a customer and i got some basic Information about the application/Service. We are talking about SharePoint/Skype/Exchange and i've got many datas directly from the server guys.

 

I have this informations:

 

L4 Connections/s

 

Skype: unknown

 

SharePoint: 1.600.000

 

L4 HTTP Req.

 

Skype: ~25000

 

SharePoint: ~15000

 

L4 concurrenct conns.

 

Skype: unknown

 

SharePoint: ~1.600.000

 

L7 Connections/s

 

Skype: ~900.000

 

Exchange: ~360.000

 

SharePoint: ~140.000

 

What model would you prefer? And there are also thoughts about using the F5 LTM in mode ssl passtrough. So the SSL Traffic would just pass the LB. Would that change anything in the needed size of the LB model/series?