I certainly support other Members' suggestion to purchase the pen you want, then have a stock Western B - BB modified to the desired shape and set-up for the wetness you prefer; and that hand-tuned steel nibs can be very good indeed. I have a 1.0 Stub ground from a Pelikan M200 g-p steel BB from the well regarded Mr Binder, which is in the OooLaLa category.
Keeping within your criteria of a new, full size, gold Stub nib pen with some heft, <USD300, kindly consider the Waterman Carene. One of my Carenes is fitted with the factory stock Stub, which is a lovely writer. The Carene has proven to be highly reliable, and is a favourite for long haul writing. I also have a Parker Sonnet with a gold factory stock Stub, which is wonderful, but I prefer that of the Carene - perhaps the Carene's inset nib makes it just that bit more firm than the open nib of the Sonnet, so I find it easier to keep such a wide shaped nib running evenly on the sweet spot (?)
As good as factory stock Stubs can be, you may still choose to have them hand ground to achieve a higher ratio of down-stroke to cross-stroke line width, and a more clearly defined sweet spot.
I'm not so sure the Japanese B nibs would give the 1.1mm down-stroke line width you desire. However, some Sailor pens can be had with gold two-tine Music (MS) nibs, which I reckon could be modified to a 1.1 Stub. I have a 1911M with an MS nib, which would likely be too small and low mass, so a larger model might be up your street.
As ever, we are spoiled for choice.
See also: 'What pen has the best Stub nib you've ever used?' http://www.fountainp...used/?p=3109584
Edited by Sandy1, 19 September 2014 - 12:48.