A while back, stock replacements for the DVD drive were available on eBay for like $30 a pop. I know I'm looking at getting one in the near future. As it is, I have to put a motor in my circa-'97 Playstation, so this is just par for the course I guess. I've been getting more and more errors on my Xbox as of late, but luckily they're far and few between. It's a 1st-gen Thompson.
I know people were able to use PC drives, but I don't recall if they had to perform any other mods. I'm sure it wasn't all that asthetically pleasing either. I'm more concerned with games running than I am the system looking pretty.