The Bosch CS5 Circular Saw
This is a great little circular saw working off the mains electricity. Its a light saw but its full size and as powerfull as you are likely to need. One key feature is the left-side blade which makes it easier to see what you are cutting. There are a couple of minor things to look out for though. One is to take care of how you put it down and use it, the base plate is prone to damage, and if you are going to do a lot of heavy ripping be wary and give the motor time to cool down. There have been a few issues around reliability. However for most users it is an excellent circular saw and it gets a good rating.