Psion
Adventurer
Doug McCrae said:A caster class? 3e warlock takes up 12 pages. 4e warlock is 14 pages, and that's with 4e's greater use of white space AND including paragon paths which are analogous to PrCs. The two editions are practically identical in this respect.
Of course they are identical, because the 3e warlock is essentially a preview of the 4e design philosophy.
But a real 3e caster class using native 3e design philosophy which doesn't require you to re-invent the spell list is a bit easier task.