You can get nice shoulder (or higher, if you're short in stature like me!) length gloves here...
These guys are great and I can vouch for both the business and the gloves!
I also tend to get dry skin, and if I'm mucking around in the tank without gloves for any length of time, my hands are pretty dry the next day. As mentioned earlier, salt water isn't the nicest thing to skin - it's pretty caustic, whether it's our tanks or the ocean.