What should I buy?

[Olaf the Stout]

Already been said multiple times but I'll add my 2 cents anyway.

Spell Compendium
Magic Item Compendium
Player's Handbook 2

Olaf the Stout

 

[Angel Tarragon]

I'd go with the Spell Compendium or Magic Item Compendium personally.

QFT. I'll be buying both very soon myself.