Mark,
Go look at the new Fox International 2 speed spinning reel ! it might not quite be up there size wise, but your dream is pretty close to already here. heres the blurb from the website.
"Stratos 20000 TS
Introducing the new Stratos 20000 TS Twin Speed Spinning Reel. The first reel of its kind to be specifically designed for high speed jigging in deep water. The unique gearbox of the 20000 TS allows you to change seamlessly, with the flick of a switch, from a high 6.1 to 1 ratio, to a low 2 to 1 ratio to cope with the demands of high speed jigging.
At 6.1:1 the retrieve speed is perfect for working large deep water jigs to induce the best action and increase the strike ratio. Once you have hooked up on a large Amberjack or GT you can then reduce the retrieve ratio to 2:1 to help you crank your specimen up from the depths. We have all suffered from dreaded lock up on fast retrieve reels and the stalemate situation that then follows; this reel makes that a thing of the past!
Our two speed gear box has taken three years to perfect and is protected by a worldwide patent. The high torque gearbox runs on stainless steel gears for maximum strength and is supported by 16 top quality stainless steel bearings.
The FOX CDT drag system is not only smooth but also immensely powerful and may be adjusted to a maximum of 40 lb of pressure thanks to the CCD configuration. The inertia start up is absolutely minimal ensuring an ultra smooth operation. The drag itself is fabricated from high quality carbon lubricated with our own special oil. The design of the system has resulted from thousands of hours of testing in a vast range of temperature and climatic conditions. Once you have set your drag the spool safety lock (SSL) system ensures that it does not back off or tighten during a long battle with a heavy fish. The ultra-strong body is made from top quality machined aluminum for lightness and integral strength.
The ultra-strong body is made from top quality machined aluminum for lightness and integral strength. All body parts have also been specially treated to ensure a high corrosive resistance.
The line capacity is enormous allowing you to use in excess of 350 yards of 50 lb braided line. As well as being ultra-strong this is a stunning looking piece of kit and comes in at just under 40 oz in weight.
The Stratos 20000 TS will allow you to get the utmost out of high speed jigging as well as similar big fish disciplines that require speed, strength and cranking power."
it has a 35lb drag rating which just squeaks in.