i would run two RG6 lines to every room and bring all of them to a centralized closet for access. See some satellite receivers need two RG6 lines so running two would just be future proofing. even if you dont hook these up leave them behind the wall and on the other end in the equipment closet label all of them. As for the Cat6 run as many as you think you will need for each room one may be fine for the bedrooms but the office you may want more. You will need to run a switch to split the CAT6 so run some sort of switch as for a gigabit switch only get one if you do alot of file transfers in the house from computer to computer otherwise you are just wasting money on something you will never use. What was said earlier about CAT6 for the phone line do it if you but a spool of 1000 feet of CAT6 you should be able to run all if not most of the line for the house.
Try this place out for all your materials
http://www.monoprice.com/products/department.asp?c_id=105
I use them for everything. you should be able to get everything from them, and I have found them to be the best prices on almost everything. If you want it to look really good you can run keystone jacks on the walls and it will look real professional. Well good luck with the project.