Ken -
I'd take Kurt's advice and rebuild all 4. At $12/kit it's pretty cheap. The first thing I did to my car was refresh the entire braking system - new hoses, rebuilt the calipers, etc. I even made some custom tools to make extracting the pistons easier.
If you want, you can bring your car over to my house and we'll rebuild your calipers. I have the tools (including the compressor) and I've done this more times than I can count, so it should be a quick process (because, you know, there won't be any hidden gotchas, right
). It'll have to be a weekend day as I'm away on business most of the week. Anyone else want in? We can have a big Dorki caliper rebuilding workshop!
BTW, I have OEM rotors and rubber lines, and my brakes feel like someone threw an anchor out the window. I'd skip the SS lines and cross drilled rotors and start to worry about the slotted ones when your brakes become the limiting factor to your performance driving. If you're a green newbie like me, this will take a while and you'll probably be ready for new rotors by then anyway.