Thanks to Daiku and ZAC for your replies. One thing I'm specifically wondering is whether anyone knows if the the Makita or Dewalt 12" sliding compound miter saw ($650 =/-) can be used for cutting timbers efficiently. They seem to have greater capacity than radial arm saws, but I'm hoping to be able to cut through an 8x8 with no more than two cuts.

Also, as far as the wide portable planers, is the new style Makita 12" worth the $2,000 they're asking for it?