All good recommendations.

Base your purchases on the amount of work you will have and how long you want to keep these tools. The good tools will be there long after the cheap tools burn out.

To build a wood fence, a right hand framing circular saw (7-1/4") can do it all. Some of the brands are: Skil, Makita and Porter Cable.
Like Spruce mentioned, make sure that the blade in on the left side of the saw, making it visible when being used if you are right handed.

Don't forget to send pics when done!