kylawyer, PEX is great. I'm sure there must be some downside to it, or maybe something is going to crop up in a few years, but installing it is a dream. It bends around corners which means less joints, it is as resistant to ice bursting as anything out there and connections are easy. Cutting it is simple with a $7 tool. Splicing into it later is a snap.
I've sweated copper and it is a fairly straightforward process but in fact it does require a certain amount of skill....which I clearly do not have. With PEX you use a sort of crimp tool. The tools cost over $100 and most projects will need two sizes. But, HD rents them for cheap. Crimping the rings is virtually fool proof. (Yeah right, but I plumbed my 1000 sq ft cabin myself including tank, water heater, etc and there were
NO leaks and none since and thats been at least two years. So, given that
I could do it, I consider it idiot proof.) They make all sorts of transition peices to go between different types of pipes and fittings.
Eddie, I agree about the copper. So far we've had two major leaks in my home. The copper is probably 30 years old and our well water abrades the copper at joints. The copper actually eroded through. One leak wa minor, one was not but neither caused much damage because they were under the house and we caught them quickly. With our water the copper also staines all the sinks and toilets blue/green. I've replaced all the copper that doesn't require tearing out walls with PEX. I worry about the copper in the walls.
As far as paying someone. I do when I don't have the time to do a repair, but over the last few years the local guys have done pretty shoddy work and I end up re-doing things myself. Lately I have found a good plumber (who replaced all my copper) and he did excellent work.
One last thing about PEX. One of the coolest things I've seen is a manifold system (which may work with other things besides PEX) in which you run your main hot line to one central manifold and your main cold to another. Then you run individual small lines to
each fixture! This way you can control flow to each individual fixture from a central manifold. If I ever build a new home, I'll do the manifold thing.