IMHO I think the first step, assuming you only have a budget for 1 extra machine, would be to move your MSSQL installation onto a separate box to free up some more resources for CF. This'll save you a bit too as you should have most of the software licenses you need too.
After you've done that you could look at adding extra CF servers and hardware/software load balancing in. Perhaps it'd be best to have the busy site on it's own high spec. shiny new box and keep the quiet sites on the existing server. My 2p worth, Ant ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| Special thanks to the CF Community Suite Silver Sponsor - New Atlanta http://www.newatlanta.com Message: http://www.houseoffusion.com/lists.cfm/link=i:4:188239 Archives: http://www.houseoffusion.com/cf_lists/threads.cfm/4 Subscription: http://www.houseoffusion.com/lists.cfm/link=s:4 Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=89.70.4 Donations & Support: http://www.houseoffusion.com/tiny.cfm/54