Thanks J.D. for your informative reply. I am definitely not looking for an overview of his work, only a good sampling of his horror.
I was comparing the contents lists and I noticed that "In the Midst of Life" and "Can Such Things Be?" both have less stories than the wordsworth edition and that most of their stories are contained therein:
Terror by Night: Classic Ghost and Horror Stories (£2.46)
An Occurrence at Owl Creek Bridge
The Moonlit Road
Haita the Shepherd
The Secret of Macarger's Gulch
The Eyes of the Panther
The Stranger
An Inhabitant of Carcosa
The Applicant
The Death of Halpin Frayser
A Watcher by the Dead
An Imperfect Conflaguration
The Man and the Snake
John Mortonson's Funeral
Moxon's Master
The Damned Thing
The Realm of the Unreal
Chickamanga
A Fruitless Assignment
A Vine on a House
One of Twins
Present at a Hanging
A Wireless Message
One of the Missing
An Arrest
A Jug of Sirup
The Isle of Pines
An Old Man Eckert's
Three and One are One
The Spook House
The Middle Toe of the Right Foot
The Thing at Nolan
The Difficulty of Crossing a Field
The Affair at Coulter's Notch
An Unfinished Race
Charles Ashmore's Trail
Staley Flemming's Hallucination
The Night-Doings at 'Deadman's'
A Baby Tramp
A Psychological Shipwreck
A Cold Greeting
Beyond the Wall
John Bartine's Watch
The Man out of the Nose
An ADventure at Brownville
The Mocking-Bird
The Suitable Surroundings
The Boarded Window
A Ladt from Redhorse
The Famous Gilson Bequest
A Holy Terror
A Diagnosis of Death
In the Midst of Life: Tales of Soldiers and Civilians (£10.90)
The Suitable Surroundings
A horsman in the Sky
An Occurrence at Own Creek Bridge
Chickamauga
A Son of the Gods
One of the Missing
Killed at Resaca
The Affair at Coulter's Notch
A Tough Tussle
The Coup de Grace
Parker Adderson, Philosopher
A Watcher by the Dead
The Man and the Snake
A Holy Terror
An Inhabitant of Carcosa
The Boarded Window
The Middle Tow of the Right Foot
Haita the Shepherd
An Heiress from Redhorse
Can Such things be? (£15.29)
The Death of Halpin Frayser
The Secret of Macarger's Gulch
One Summer Night
The Moonlit Road
A Diagnosis of Death
Moxon's Master
A Tough Tussle
One of Twins
The Haunted Valley
Jo Dunfer Done For
A Jug of Sirup
Staley Fleming's Hallucination
A Resumed Identity
A Baby Tramp
The Night-Doings at 'Deadman's'
Beyond the Wall
A Psychological Shipwreck
The Middle Toe of the Right Foot
John Mortonson's Funeral
The Realm of the Unreal
John Bartine's Watch
The Damned Thing
Haita the Shepherd
An Inhabitant of Carcosa
The Stranger
As you can see, these are both significantly more expensive than the Wordsworth edition so it is hard to see the benefit of getting these, especially when I don't even know if I'll like his writing at this point.
Ghost and Horror Stories was slightly cheaper (£8.09) but I can't see what the contents are for that one.