Re: What size compound mitre saw do I need?
A 10" will do most work, though as jkirk points out, the size of the trim will dictate.
On a personal note, I've had a 10" which worked great for most things and I upgraded to a 12" a few years back. To be honest, the 10" is nearly as useful as the 12" with the added benefit that the smaller blades are cheaper to purchase and resharpen. The 10" is also just a tad smaller in all dimensions, making it easier to move around if necessary.
I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!