Mike mentioned some important facts that I forgot too. Make sure you get the correct blades for your saw, and yes, check the amperage size. Like Mike said, the amps., will tell you which is for which, reg. home use or industrial use. What you really have to decide is, how much do you intend on using it and for what type of work. (Heavy usage or lite usage).
I should also note... if price is an issue. Many people naturally never think of a "pawn shop". You will be surprised what kind of bargains you can get even with top brand names. However, this option is more of a "Buyer beware" type of thing.
***Please fill in your profile, at least your location. As this will help us help you better.***
"Whether active duty, retired, national guard or reserve - is someone who, at one point in their life, wrote a blank check made payable to "The United States of America", for an amount of "up to and including my life". That is HONOR, and there are way too many people in this country who no longer understand it." -Author Unknown