I have used silicone lube for a while now (currently using ID Velvet, which is the nicest one I have found so far) - it's a thinner consistency and definitely stays slippery longer than water based lube - needs soap and water to get it off though, water itself only seems to make it more slippery. It's condom safe too.
More expensive than water based lube but I don't think I use as much so the bottle seems to last a long time.