Hey Dawg:
I just got into the whole doubles thing myself. I had the same number of dives as you, and didn't feel overwhelmed by the extra tank.
Some things to consider are
1)exposure protection- Im not sure what temp the water is around you (I dive in cold water, and had to get a dry suit, or else the extra gas on my back would have been wasted because I would have had to come up due to cold anyway)
2) Further certification -Either Nitrox or decompression or both (otherwise what is the point of the extra gas.....you need to be able to use the bottom time somehow)
3) Physical ability.....depending on the size/material of your doubles, they can get pretty heavy. In my opinion, that is the only reason that people would not be able to dive doubles.
4) Bouyancy concerns- you must have a kit with enough lift to support the doubles....this may mean purchasing more or different equipment (new bc or wing, lift bag, or drysuit) Redundancy is important too, since swimming up a set of doubles after bouyancy failure is far tougher than swimming up an AL80.
Other than that, I find the doubles easier to find trim with, and they are no problem under water......up top they are a bit of a hassle, and learning how to route the hoses and such to make them convenient is tricky, but nothing you cant handle. Getting set up so you can reach the valves and isolator is another skill set, but again, not beyond most folks.
Beware of "the logical" train of thought however.....ie "since I now have doubles, it would be logical for me to have.........." I've been following this train now for about 6 months, and am almost broke now
. Keep telling yourself (and your significant other) that you are buying the gear to make yourself a safer, more competent diver.
Good luck.
Wetvet