Aye, a good lurcher to lurcher bred animal, with a focus on performance rather than looks is the way forward.
However, my whippet is a big lad, and he excels at ferreting, and is one of the best dogs I've ever witnessed for hunting ability. If there is game around, he'll find it, rise it and usually catch it.
I've spent a bit of time around wheatens and they are great dogs. However, not for the faint hearted, they can often be extremely dog aggressive, and dry driven. Bit of a handful at times. They were originally bred as a strong dog, for drawing quarry after a dig, and for working badger (pre ban in 1970's).
Before the more recent ban, wheaten x greys were a very popular vermin dog for hunting fox day and night.