What ever you buy check the display model for shaft flex. This is the nasty bit that will throw the cut out for the precise work.
DOn't BuY ANY CHEAP CRAP
Is this cheap crap???? :)
http://www.youtube.com/watch?v=X1A6hW4ltA8
A junior hacksaw will be best for you :p
These are noice http://www.gettoolsdirect.com.au/fes...FcgbpQodqG0AQg
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I have All of those tools and owned a Cabinet Making business for 10 years. In a Heart Beat a Sliding Compound Saw is the only one to get.
If you have the funds then a 12" will be better than a 10" and will happily cut your 100x100 posts.
A Makita or Hiatachi make a great unit and the higher end will allow you to service it and make the finite adjustments to your angles which will need adjustment over time.
The Makita will flip to the left and right for a 45 mitre and my Hiatachi will cut 45 in rotation one way and 55 rotation the other.
A table saw is not really needed for the home user to be honest when you can go to bunnings and they have a racked panel saw and charge $1 a cut!!