Should we try to re-use the copper lines since copper is valuable or just replace it with stainless steel supply lines from home depot. Obviously, just replacing the lines seems easier and cheaper, but I want to do what is best in the long run. Thank you very much.

It is going to be lot easier for you to replace these copper water supply connectors with stainless steel, braided, flexible water supplies. They are very easy to install, HomeOwner friendly and inexpensive. They also look good and are quality made. Back to you. Milo

Thank you for your quick reply! What would you suggest we do with the several feet of copper that is connected to all the faucets? Is it worth much?

What would you suggest we do with the several feet of copper that is connected to all the faucets? Is it worth much?
Depends on how much you have. Copper is going for around $4.50 a pound at the scrap yard. Good luck, Tom

Copper is valuable but your amount may not be worth the gas to drive to a scrap yard. I have a bin full of scraps that come in handy from time to time. I support Milo's approach. Consider installing 1/4 turn stop valves too.

You won't get too much for this small amount of copper. I don't think it is worth of your time. I just turned in bucket of "dirty" copper yesterday and got paid $2.75 a pound.

You guys are so helpful! It seems u all agree that it's not worth preserving the original copper lines. I've always thought that copper was considered the highest quality material for plumbing and was concerned about ripping out the "good stuff" to replace it with a less expensive and possibly lower quality material -- or perceived lower quality from the perspective of a future homebuyer! Yes, I watch a lot of HGTV! :-)