Wouldn't it also screw you over on updates and potentially breaking something? I figure it was much more difficult to set them up separately, but iit would be better in the long run if it was done that way. I've got Mandrake set up on a laptop. I am looking at using Fedora though, simply because there's a how-to. There are a couple of things that bother me, how do I marry a second hard drive at a later time and how difficult is it to set up? Also is there anything special we'd have to do if the power went out and the pc shutdown? Is it just a couple of commands and mythtv is back up?
Yes, it makes using Linux over the long run very painful. If you don't mind investing some time and effort -- Gentoo is a great way to go. Otherwise, I'd recommend SuSe 10.1 or Ubuntu. They are by far the best non-poweruser distros. Fedora and Mandrake don't even come close. If you go with Ubuntu, read my "how to install linux for the total n00b" thread atop the Sports Bar.