If you are looking to retool I'd look at Bosch or Milwaukee. The older Dewalt 18v was pretty good when it first came out but they can't hold a candle to the new Lithium Ion offerings. Milwaukee red lithium and FUEL is simply amazing. Bosch is tough as nails, has a no questions asked policy if something breaks and a 3 year warranty. If you enroll into the Bosch Provantage program they will overnight new tools to you if something breaks.
Porter Cable? I gave some of the 18v stuff a try, for the same reasons as you mentioned. The drill was decent but really freaking big and heavy. The rest of the tools sucked. Their flashlights are about as bright as a mini-mag with half dead batteries, the recip saw was worthless for anything more than PVC pipe. The circular saw was junk, you could cut about 5 studs on a battery.
I've used a bit of it all. A couple years ago I picked up a Bosch 18v drill to use in my shop. It quickly replaced the drill on my truck and I brought the old Dewalt to my shop. Today I've ebayed all my Dewalt 18v and retooled with Bosch.