I use water-based lube almost exclusively, since so many of my toys are silicone. I used to really love System JO H2O, and still do, but lately I've been feeling that Sliquid H2O is the best for me. It dries up a bit faster, but JO dries a little bit sticky (dunno if I'm just noticing it more or whatever), while Sliquid doesn't. Plus, Sliquid lubes are very body-safe, while JO has glycerin and a ton of parabens.
Sliquid still can't top JO when it comes to flavored lubes, though.
Mine's Liquid Silk. I've used a couple different brands, and I keep going back to it. I'll buy some Maximus eventually, since Liquid Silk isn't as great for anal play, but I'll probably always have a bottle of Liquid Silk on hand.
I prefer water-based, too, partly because of my silicone toys and partly because silicone lubes are so much harder to clean up. But I am on the hunt for a good silicone lube to use in the shower (I have mastered wrapping most of my toys in condoms to keep them safe.) Heard good things about Pink and Toko, but haven't tried either yet.
JO H2O anal. Its thick enough to not make a mess when lubing up. It stays slick for as long as we need it to be, for PIV sex. It will work for 20 minutes or so for solo masturbation. I have never had a problem with it, great stuff.
Anyone use oil based lube? I'm looking for something for intercourse, and probably won't use it with toys much, because I'm not a big fan of ID's water-based lubes, so I'm worried about trying others that are just as runny and messy.