Hitachi circular saws are the mutts nuts IME with really good cast ali baseplates.
Some of the Mak ones are better than others IME. The Site badged version I got from SF is ok for th3e money[1]- certainly massively better than the B&D proline one it replaced (and the proline stuff was a fair improvement on the normal B&D fodder)
[1] SF are still knocking out the 110V version at £30 which is a very good price...