anjohl: See topic.

Starkrun: Lionheart: Legacy of the Crusader
Its starts off like a RPG, but after you leave the city its a hack and slash gear up game... very good if you like both styles...
Might i add that Titans Quest: Immortal Throne is cheap and one of the best there is.
Also, Divine Divinity is easily the closest thing you can find to diablo next to Sacred.
If all you want is a Diablo 1 clone look no farther then Fate: The Traitor Soul ((orignial is fun but theres a way to unlock the content form the first on in TS))
Also if you want the next game from The Creators of Diablo check out the $20 title Torchlight comming in a few weeks, with Torchlight you are given every single program they used to create the game, meaning you have everything Runic Games used to create the game. 15 days coming and counting.
Also i urge you to keep an eye on Crate Entertainment They are the lead brains behind Titans Quest and have some ideas that could easily de-throne Diablo 3 as the new game to have. They were the leads for ideas and art for Iron Lore and created Titans Quest. There new game is fantastic and i would get that over Diablo 3, as i know i can trust that they will do it right.
Gamasutra Crate Entertainment Info and talk about RPG's in general, a great read if your into ARPG's at all and the state of RPG's on the PC

anjohl: Is Titan Quest on GOG?

Sielle: Unfortunately not. =/
So far, the only things listed that are on GOG are Sacred Gold and Lionheart: Legacy of the Crusader.

Starkrun: Awww i said Lionheart and linked to it and i didnt get the solution...
c'est la vie

Sielle: In Lionheart you chose 1 of 8 pre-generated characters "or" you can custom make one like a lot of RPG's.
Edit: I see you marked this as the solution. Don't forget to give Starkrun a "+1 rep" they helped answer the question as well.

Zolgar: One small note:
Sacred is like Diablo in character selection. You choose your 'character', which is a pre-defined look for a given class, and each one can do specific things. each has strengths and weaknesses, as well as areas of focus.
From there as you level up you can customize your characer, selecting skills, abilities, how to place their states, etc.
Lionheart, however, uses the Fallout character rules.
You build it at the beginning, but.. once you've built your character, you've more or less defined them, there is less customization as you level up. (Still a fair amount, but.. not a lot)
Also:
A lot of reviews I've read say that Lionheart sucks later game. Sacred, however, ... the only problem is there's too much to do >.>

anjohl: Hmm. You make an interesting case for Sacred. I am still undecided, but at least I know my choices now. Danke.