Something I've learned from this forum is how much lurchers are loved in the UK. I find this amazing since I didn't even know what a lurcher was until I joined up here. Turns out that there are those who might even prefer a lurcher to a purebred deerhound!!!
That got me interested so I ordered Jon Hutcheon's
The Lurcher: A Complete Guide 2007 to find out more. He has a chapter that discusses the various lurcher crosses. There's the sighthound to sighthound crosses (Long dogs) which include Deerhounds, some Salukis, and mostly Greyhounds. He said the Whippet tends to be used as a 2nd cross within a sighthound to sighthound line. The other sighthounds don't make good lurchers (sorry, just the author's opinion

Go ahead and love your IW, Afghan, Borzoi and Ibizan crosses as much a you want

).
Then there are the terrier crosses, esp. the Bedlington, the Bull Terrier, and the Whirrier(which includes most other terrier crosses besides the Bed. and BT). But wait, there are even more crosses that can be classified as lurchers! The herding crosses, with the Border Collie and Bearded Collie being the most common, but the Australian Cattle Dog is becoming the latest "in thing" for working lurchers. Finally, some lurchers are even gundog crosses, particularly the Labrador, Spaniel and Retriever lines.
All this being said, for a lurcher to be a lurcher, it must have some sort of sighthound blood in it.