My first real power toy was a radial arm saw. I almost never use it now. I
mostly use my Delta compound miter saw (10" blade) and the table saw. I
still get the big sheets chopped down to a manageable size at the store
using their panel saw.

A 10" compound miter saw will make all the cuts listed above except the rip
cuts and leave you a little room for other things later on (like crown
moldings). A 10" blade saw will cross cut 1 or 2 X 6 stock at all useable
angles and cut 4 x 4 at least 90 degrees. A table saw is far superior to an
RA for ripping stuff. I would even go so far as to say an inexpensive table
top table saw is superior to an RA for ripping as long as you secure it to a
stable table. Short term for ripping buy a $10 rip fence to fit your circ
saw.

Thanks for pointing out the size of mitre saw, I was wondering if we'd
go with a 10" or have to go to a 12". Excellent advice on the circular
saw, I'll have to pick one of those up when we get to the plywood. We're
a little lacking in saws around our house. :-)