circa 2006 pretty version of "O-o-h Child"

In 2006 I was in a store in Alexandria, Virginia, maybe a Hallmark or CVS store, and there I heard a particularly beautiful version of the classic oldie...

O-o-h Child (Five Stairsteps, 1970, "The Stairsteps" album)

The lead singer was male. The part that really stood out was the female background vocals, which were a very pretty high sustained "ooh" while the man was singing the verse. I think those background vocals were all on the same high note, but they might have been in harmony, too. Otherwise the version I heard was very much like the original...

http://www.youtube.com/watch?v=bmDakhg45rk

The version I heard sounded heavenly: it was very smooth, slower than the original, the high female vocals were sustained longer and louder than in the original, and there may have been strings, too. The song felt like it was floating.

I did an extensive search of all the versions I could find, and I contributed my findings to the Wikipedia page about this song at...
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http://en.wikipedia.org/wiki/O-o-h_Child

Cover versions

* Beth Orton covered the song on her album The Other Side of Daybreak, which was also featured on the Alias episode entitled Repercussions and CSI: NY episode entitled Unusual Suspects. This is a soft, acoustic guitar version.
* Mary Wilson from The Supremes covered this song in 1989, and released it as a single.
* Dino's version hit #27 on the Billboard Hot 100 in 1993.
* Nina Simone covered it on Here Comes the Sun
* Valerie Carter covered this song for her 1977 release Just a Stone's Throw Away.
* Trey Anastasio has covered this song live in concert numerous times.
* Spike Lee covered the song in his 1994 film "Crooklyn"
* Napoleon Murphy Brock
* Edwin Hawkins Singers
* Marvin Gaye
* Godkiller has a version with samples.
* Hall & Oates have a version from 2004.
* Richie Havens
* Cyndi Lauper & Destiny's Child have a live version with multiple female singers.
* Donnie McClurkin & Kirk Franklin have a rap-influenced version.
* Melanie (Safka)
* Milton Nascimento
* New Birth have a rockish version.
* Nice & Smooth have a version that contains hip-hop samples from the original Five Stairsteps recording.
* Bruce Ruffin has a reggae version with backing female vocals.
* Dee Dee Sharp
* The Spinners
* Stormy Weather
* Lenny Williams
* The Wondermints
* Yoshika has a version on her Timeless CD of 2006.
* Girl Talk includes the chorus of this song in Once Again, in the album Night Ripper.
* Ed Hamilton, album "Groovology" (1998)"[1][2]
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Here is my assessment of those versions as pertaining to the version I'm seeking:

MAYBE:

The Wondermints - much like original, with male vocal & horns: http://www.amazon.com/Wonderful-Worl.../dp/B00004YU4C

UNKNOWN:

Marvin Gaye
Stormy Weather

UNLIKELY:

Edwin Hawkins Singers
Melanie
Milton Nascimento - unlikely, Jamaican type accents
Yoshika - 2006, "Timeless" CD

NO:

Trey Anastasio - always live versions with electric guitar: http://www.youtube.com/watch?v=nMUhxJm-GKg
Napoleon Murphy Brock - primitive sound: http://www.amazon.com/O-O-H-Child/dp/B0019VTXU2
Valerie Carter
Dino - dance rhythm: http://www.youtube.com/watch?v=Oq5UIwsM96w
The Five Stairsteps
Godkiller - samples
Hall & Oates - 2004, has strings but weird sound effects and no female vocals: http://www.youtube.com/watch?v=0RY0uS6KPRc
Richie Havens
Cyndi Lauper - live
Donnie McClurkin & Kirk Franklin - rap-like: http://www.youtube.com/watch?v=nUSY1ydMpi8
New Birth - rockish: http://www.youtube.com/watch?v=cUsHr7jqpfI
Nice & Smooth - rap sample
Beth Orton
Bruce Ruffin - reggae, but has high sustained female vocals: http://www.amazon.com/Ooh-Child-Original/dp/B000T46W18
Dee Dee Sharp
Nina Simone
The Spinners: http://vimeo.com/3338245
Lenny Williams - closest so far: http://www.amazon.com/Ooh-Child-Lenn.../dp/B000002QK8
Mary Wilson

Does anybody know which version I'm likely to have heard?

P.S.--I haven't heard the entire Lenny Williams version, only that Amazon.com sample above. Maybe the female vocals come in at a later point?