If you want 200W, I would suggest a triple 18650 mod-I am not saying it is not possible to hit 200W on 2 18650's, it is just very optimistic and often can only happen while the batteries are still at a higher voltage.
The triple 18650 mods are in general pretty large, I have small hands too though and find the rx200 to be comfortable to hold-if you turn it around so the fire button is away from you, it is actually pretty ergonomic.
For dual 18650's though, the RX 2/3 is very nice, and comfortable to hold. It is firmware updatable to 200W in dual 18650 config, and with the two included battery doors you can choose to use it in dual or triple 18650 configuration.
For your price range, I feel this would be a good mod, although you may prefer other mods mentioned in this thread, and also they don't suffer from the 510 issues of the wismec/Joyetech devices.
Another option would be the Xcube ultra or H-Priv, myself I own the original Xcube and found it to be a fairly good device. I do have better devices in the collection, but at a reasonable price point I think the RX2/3 would be hard to beat.