Well, being as I've never really made a theif and want to make a rares theif (non-pvp only) I was thinking to using this template.

100 Detect Hidden
100 Lockpicking
100 Magery (I'm assuming this would take care of Healing, Hiding, etc.)
100 Snooping
100 Stealing
100 Remove Trap
100 Resisting Spells

for doom thief, you do not need snoop, remove trap, or detect hidden.
Magery (telekinesis) takes care of remove trap. Reveal takes care of hidden.

Try
120 magery
120 eval
120 med
120 steal (better chance at success)
120 hide
120 stealth

you can actually get away with only stealing, since you need 30 hide to get thief guilded for stealing from other players. I suggested 120 in hide/ stealth to give you more options. Stealther can complete the minotaur strongbox quest easier than anyone. Lotsa fun to explore with. And decent template for doom.

Hiding only goes to GM.

Imho, you dont need Eval as you wont be killing anything if youre strictly an arty thief. Much better to throw Ninjitsu on the template that will give you access to:

Animal Forms with various bonuses
Smoke Bombs to break line of sight and hide without the casting delay of Invisibility
Mirror Image spell that allows you to throw the baddies off you after a successful steal before you can hide again