ToME: the Tales of Maj'Eyal

Over on Steam, I see that there are a couple of different "versions" that you can buy. Can someone tell me what the difference between the "Tales of Maj'Eyal 4-Pack" and the "Tales of Maj'Eyal - Collector's Edition" is? It doesn't seem to be obvious to me, unfortunately.

As a side question, does the purchase of the game through Steam get me any of the donor perks?

The Version on steam is a donator bonus version so you get donator perks. The 4 pack gives you four copies of that donator bonus, one for you and three to give away to friends.

The Collector's Edition is basically the GOTY edition, the base game and all the DLC included. Which at the moment is fifty percent off and a great deal.

Awesome, thanks!