I'll change my vote to option 3, circular saw with a guide.
Gary
Can you get the same quality of cut (splinter free, etc) as you would get with a table saw or sliding miter saw?
James
For this kind of job I use my circular saw with a Freud 40T blade. I apply masking tape centered on the cut line on both sides of the board. That virtually eliminates chipping.
I use a SCMS for most all of my cross cutting. I use a sled on the table saw for whats beyond the capacity of the SCMS (I think it's good for about 10 or 12 inches).
PHM