Yes you should just use RG6. Anything more for your application is just a waste of money.
There are many solutions for the connectors. I have about 100 f-rca connectors which is what I use. You put a good quality F connector on the coax and then screw them onto the RCA adaptors. The tools to make really good connections (such as cable-pro and Digicon as well as a good coax stripper) cost a bundle (about $150) but your local radio shack will have some cheaper solutions like twist on connectors which are not as good but may be just what your looking for. You can buy some intermediate tools at the Shack or Home depot as well for about $50 if you think you'll be using them again I guess.
There are many solutions for the connectors. I have about 100 f-rca connectors which is what I use. You put a good quality F connector on the coax and then screw them onto the RCA adaptors. The tools to make really good connections (such as cable-pro and Digicon as well as a good coax stripper) cost a bundle (about $150) but your local radio shack will have some cheaper solutions like twist on connectors which are not as good but may be just what your looking for. You can buy some intermediate tools at the Shack or Home depot as well for about $50 if you think you'll be using them again I guess.