Wow i found a seed with a skeleton mob spawner and a spider mob spawner literally 8 blocks away from each other which is also 14 blocks away from a slime block. Seed -848195197 and the co-orda are x-382 y 25 z-281 and the slime block is x-368 to 352 y -288 to -272. If u want it all in one place this is about as good as it gets. The seed has some nice views as well. oh and theres supposed to be 20 other spawners scattered throughout. these ones werent found by the original finder of the seed. Heres the co-ords for the other stuff he recorded. Theyre not terribly accurate but close enough
#1 - X: 23, Y: 38, Z: -208
#2 - X: -23, Y: 33, Z: -185
Blaze Spawner (Nether) - X: -67, Y: 65, Z: 59
Blaze spawner (Nether) - X: 58, Y: 65, Z: 59
Cave Spider Mineshaft - X: -349, Y: 36, Z: -209
Cave Spider Mineshaft - X: -371, Y: 31, Z: -252
Cave Spider Mineshaft - X: -385, Y: 31, Z: -281
Cave Spider Mineshaft - X: -399, Y: 31, Z: -286
Cave Spider Mineshaft - X: -49, Y: 23, Z: -189
Skeleton - X: -279, Y: 28, Z: -307
Skeleton - X: -370, Y: 46, Z: -229
Skeleton - x: -414, Y: 27, Z: 291
Spider - X: -12, Y: 60, Z: -21
Spider - X: -120, Y: 36, Z: -318
Spider - X: -279, Y: 19, Z: -246
Spider - x: 40, y: 29, z: -72
Vein of Diamonds
X: -40, Y: 34, Z: 5
X: -95, Y: 37, Z: -7
Zombie - X: -114, Y: 62, Z: -222
Zombie - X: -383, Y: 32, Z: -298
Zombie - x: 10, y: 42, z: -195
Zombie -288; 49; -243 (Disc. 13)
Zombie 124; 18; -167 (Disc. Cat)
Zombie 312; 39; -166 (Disc. Cat)
Zombie 34; 16; 195 (Disc. 13)
Zombie 373; 28; -169 (Disc. Cat)