hey sircyber...honestly you should just get the q6600 and an ultra...you dont need to sli, its NOT worth it.
You should have gotten a different mobo ,etc etc, but whats done is done.
You also mentioned that your planning on finishing your build on feb-march...and if so, i would wait for teh q9450....
you could get the e2180 and oc it mad for now but then get the quad(expected release date is Jan)