[damien c]

The cable that they use is RG6 internal which is White in colour or Black for external use which would, be your best bet seeing as it is going under the floor.

You would then need some RG6 F's and a Compression tool for crimping the connector's on to the end of the cable, but you would also need a cable stripper that will allow for 2 different cut's in the cable 1 to remove the outer cover, and then another to remove some of the coax material on the inside allowing for a stinger to be created, using the copper in the middle of the coax cable.

As for laying the cable's you should lay a USB 3.0, HDMI or 2 dependent on how many you need or may need, then I would also lay a Optical sound cable for connecting to a Surround sound speaker setup if you ever did one and also a Ethernet cable or 2 incase you need them for a future TV or game's console etc.