...though if you really need flexibility, I know Beldin also makes versions of RG-59 (and maybe RG-6) that are stranded. They really are flexible, but they also really limit your options for terminating the cable. (Compression connectors are right-out. A number of crimp connectors are out, too.)...
My take, especially for component, is, if you've got one, use it. If you're going to buy, get the RG-6. If you're doing HD-SDI or something like that, use the RG-6. If you're doing SD, then pretty much anything you do is okay with RG-59 - unless, maybe, you're doing really long runs (>200 feet.)...