IMHO it all depends on what you are using the tools for. If you are a carpenter and build houses you have very different needs than if you a weekend hack (like myself) who uses the tools occasionally.
Being a weekend hack, and at the risk of offending the hardcores on this board, I love cordless tools. I literally found a Dewalt cordless drill 14.4v in the road about 7 years ago, bought a charger, and have used it ever since. (felt bad for the poor chump who lost it, put a sign up on a telephone pole near where I found it saying "Tool Found and my phone # but no one ever called.) It is all a matter of how much you plan to use them. I am starting to lust over those matched sets at Home Depot, where you have a bunch of cordless tools and they are all using the same batteries, I can see how that would be nice.
Save the flames, I know I have revealed myself as a pretender by the fact that I recomend: 1) cordless Tools 2) buying tools at Home Depot; but it makes a lot of sense if you are like me, and only get to use them occasionally for minor projects around the house, why buy an Hummer H2 if I only drive around on city roads, sure it would look cool, and I'd feel manly behind the wheel, but when I commute 60 miles a day on city roads, it makes a lot more sense to get a Honda Accord.