i'm getting less and less impressed by technicality these days

now I just look for a unique sound, in which case, any Neil Young or Lou Reed solo will do

how will i laugh tomorrow by suicidal tendencies

Walk With Me In Hell - Lamb of God
Coming Back To Life - Pink Floyd
Freebird - Lynyrd Skynyrd
Hotel California - The Eagles
Hysteria - Def Leppard
Holy Diver - Dio
Wither - Dream Theater
Hallowed Be Thy Name - Iron Maiden
Angel of Death - Slayer
The Grand Conjuration - Opeth
Sunlit Nights - Racer X
Ghost Division - Sabaton (The way the pick the song back up after the solo is breathtaking. Feels like you're at war.)

Heres some that have been mentioned and some that have'nt..I won't say theyre the best solo's but some i personally like.

UFO-Rock Bottom
Outlaws-Green Grass and High Tides (mainly the mid song solo as opposed to the end jam.)
Thin Lizzy The Rocker and The Cowboy Song
Metallica-Master of Puppets
Ozzy Osbourne-Rock and Roll Rebel(Jake E Lee has like 4 or 5 solos during the song.) and Bark at the Moon
Ozzy Osbourne-Mr Crowley and Crazy Train (Randy Rhoads)
Ozzy Osbourne-Mama I'm Coming Home (Zakk Wylde)
Robin Trower-Too Rolling Stoned
Judas Priest-Beyond the Realms of Death
Testament-Return to Serenity
Yngwie Malmsteen-I'll See the Light Tonight and Black Star
Buckethead-Nottingham Lace,Too Many Humans and Whitewash
Eric Johnson-Cliffs of Dover
Steve Vai-For the Love of God
Pink Floyd-Comftrably Numb,Time and Shine on you Crazy Diamond
The Knack-My Sharona
Lynyrd Skynyrd-Free Bird,Working For MCA,and That Smell
Dire Straits-Sultans of Swing
Jimi Hendrix-All along the Watchtower and Purple Haze
Eric Clapton-Cocaine,Let it Rain,Layla
Deep Purple-Knocking at your Back Door,Lazy,Smoke on the Water (Especially from Made in Japan)
Iron Maiden-Powerslave
Atlanta Rythem Section-Spooky
Dio-Rainbow in the Dark,The Last in Line and Holy Diver
Black Sabbath-War Pigs/Lukes Wall,Warning
Ted Nugent-Stranglehold,Homebound,Hibernation,Dog Eat Dog,Writing on the Wall
Boston-Hitch a Ride
Pantera-Cemetary Gates
Megadeth-Holy Wars (The Pushiment Due),Hangar 18,Tornado of Souls
AC/DC-Whole Lotta Rosie,Let There Be Rock
John Petrucci-Jaws of Life
Gary Moore,Parisienne Walkways
Santana-Europa
Chicago-25 or 6 to 4,but also Hideaway..an obscure song and a b side,but has a pretty decent solo as well.)

Theres many more..by the same artists and by other ones i've forgotten,i know but these are some off the top of my head.

You're off to a good start, but the bolded, I agree whole-heartedly. I should add a few when I get some free time.

Willie the Pimp has a brilliant solo, but Muffin Man obviously takes the cake as Zappa's best solo.

Just off the top of my head..

Death – The Philosopher
Burzum – War (Euronymous did a solo here “just for fun” but it sounded great anyways)
Mayhem – Freezing Moon
Slayer – Raining Blood
Grand Belial’s Key – Foul Parody of the Lord’s Supper
Rahowa – Ode To a Dying Race
Drudkh – The Price of Freedom
Morbid Angel – Rapture
Nocturnus – Before Christ / After Death
Peste Noire – Le Mort Joyeux
Iron Maiden – The Trooper
Metallica – Master of Puppets
Agalloch – A Desolation Song
Thanatos – Dawn Of the Dead

one of the best in the 80's era is the solo of meet me halfway by kenny loggins..

I don't know about the best, I'm partial to pretty much any solo Jimmy Page has ever put down, but besides that I think I'd give it to Hendrix for "Little Wing"

Also, if you haven't seen Prince's solo on "While My Guitar Gently Weeps" at the Rock and Roll Hall of Fame Induction for George Harrison, you are missing out big time!

Don't worry, we all know thats not a Deep Purple song.;)