What's a rough ranking of the heroics ?

Easy:
Slave Pens
Mech
Seth Halls
Botonica



Medium:
Underbog
ramparts
Mana-tombs
Blood Furnance
Steamvaults


Hard:
Shattered Halls
Shadow Labs
Crypts
Arc


Does that sound about right? (In approximately that order)

I have 0 multiboxing experience in heroics beyond watching my pally die on the first pull in slave pens. I had just turned 70 when I tried it and haven't tried any since. Although my toons are a bit better geared so I'm looking to start the easy ones.