Depends on the depth of cut you actually want to do, you won't find many (If any) chop saws that will cut more than a 5" continuous thickness of timber. If you're only cutting 4-5" beams a regular 12" saw should do you, they're all pretty much the same aside from small differences which everyone bickers over so I won't say what saw is best as they all cut timber. It's the blade that makes the difference and pretty much ALL blades that come with any chop saw are not very good so it's best to invest in some decent blades if you want good cuts, Freud make decent blades for the general everyday work but if you want something more special you might want to look up CMT or Omas which make more industrial quality blades rather than trade quality.