Despite our full support of the water saving shower heads that pelt your hide like beebees, we long ago switched our home shower to the easily attachable (affordable) large overhead model like the one at right (now we have a permanent one).
When we take a shower, we want full immersion. These larger showerheads swivel right up over your head and drop a lot of water on your for full cleaning (and cooling in this hot weather!). For those commenters who worry about lessening pressure, we've never had a problem. Eric must be right that the arm reduces the diameter and so that the pressure is still good...
We have found them by many names at a number of hardware stores. Online we found models at:
The quality and the heaviness of the metal differs above, but the idea is the same.