Ok, here's a complete poaching list from gamesfaqs.com, by Matt Hobbs. I have highlighted what I consider must-haves when poaching. The rest of the items are easily obtainable by other means.

Chocobo
Phoenix Down
Hi-Potion

Black Chocobo
Eye Drop
X-Potion

Red Chocobo
Remedy
Barette

Goblin
Potion
Hi-Potion

Black Goblin
Hi-Potion
Antidote

Gobbledeguck
Mage Masher
Ancient Sword

Red Panther
Antidote
Battle Boots

Cuar
Soft
Germinas Boots

Vampire
Holy Water
C Bag

Bomb
Fire Ball
Flame Rod

Grenade
Water Ball
Flame Whip

Explosive
Lightning Ball
Flame Shield

Skeleton
Holy Water
Ether

Bone Snatch
Hi-Potion
Partisan

Living Bone
Wizard Mantle
Elf Mantle

Ghoul
Ether
Ninja Knife

Gust
Hi-Potion
Main Gauche

Revnant
Hi-Ether
Mythril Gun

Floatiball
Shuriken
Platina Dagger

Ahriman
Magic Shuriken
Air Knife

Plague
Yagyu Darkness
Zorlin Shape

Pisco Demon
Echo Grass
Hi-Potion

Squidlarkan
Small Mantle
Sleep Sword

Mindflare
Hi-Ether
Dracula Mantle

Juravis
Potion
Rubber Shoes

Steel Hawk
Phoenix Down
Hunting Bow

Cockatoris
Soft
Feather Mantle

Bull Demon
Battle Axe
Giant Axe

Minitaurus
Coral Sword
Slasher

Sacred
Holy Lance
Ivory Rod

Morbol
Platina Dagger
Ice Shield

Ochu
N-Kai Armlet
Chameleon Robe

Great Morbol
Elixir
Madlemgen

Woodman
Eye Drop
Healing Staff

Trent
Gold Staff
Fairy Harp


Taiju
Defense Ring
Defender

Dragon
Jade Armlet
H Bag

Blue Dragon
Cashmere
Dragon Rod

Red Dragon
Salty Rage
Dragon Whisker

Behemoth
Defense Armlet
P Bag

King Behemoth
Ultimus Bow
Cherche

Dark Behemoth
Wizard Rod
Stone Gun

Hyudra
Blood Sword
Scorpion Tail

Hydra
Setiemson
Rubber Costume

Tiamat
Ryozan Silk
Whale Whisker

Uribo
Maiden's Kiss
Cachusha

Porky
Chantage
Nagrarock

Wildbow
Ribbon
FS Bag

As you can see, you should be breeding and poaching from the Chocobo, Flotiball, Bull Demon, Morbol, Woodman, Dragon, Behemoth, and Uribo classes.

BTW, Nelveska Temple is the first chance to recruit Hyrudras, but not the last. Random battles in END in Deep Dungeon also provide oppurtunities.

You can meet the Uribo class as early as Zigolis Swamp, but for a long time I got them at Finath River.

As far as perfumes go, I swear by Setiemson. Putting my female units in Haste automatically is a big time saver and I can give them better knights swords than Excalibur without loosing the speed boost.