Aww come one John, no sense of adventure with soldering?
If you have the opportunity and the time, a change over from copper to PEX, even in small sections at a time, is a good idea. PEX doesn't (or isn't supposed to anyway) split when it freezes, bends easy and with PEX X Compression fittings is easy to install. The only drawback is the crimping tool is a little pricey.