I'd recommend you Sacrifice or Original War.

If you liked DD than Sacred Gold would be a good choice.
Only negative is the respawn but that helps with leveling and does not distract from the positives the game offers.
Edit: And it is 80 to 100 hrs depending on your play style . . .=)

The Demo for Arcanum can be snatched from Fileplanet - [url=http://www.fileplanet.com/59649/50000/fileinfo/Arcanum:-Of-Steamworks-&-Magick-Obscura-Demo]Here[/url]

Thanks both of you for links, I checked again all games on gog but what really catched my eye were only these two (maybe Fallout 2 too), so now I can try and decide which to play and in worst case I will pick game that cant fail Fallout 2 :)

I have boxed version of Sacred and now I dont want to spend my six dollars on digital version :) but later I will.

I tried those long time ago, but I remeber that Original War was really good made, I will think about it :) (I dont know why but I didnt like Sacrifice)

Dík, Arcanum vypadá zajímavě, ale jinak RPG je můj nejoblíbenější žánr :)

I'd rather get Stonekeep than Spellforce tbh. I don't know the length of Stonekeep, but I think it's long enough to keep one entertained, and it's very fun.

Well... If you are into strategy games as well, and don't mind open-endedness, I can REALLY recommend any of these: Capitalism Plus, Port Royale, Conquest of the New World.
If you'd prefer a non-open-ended strategy, go with Empire Earth Gold or Sacrifice.
EDIT: I've just seen you've already played Sacrifice.

Well I never tried strategies type of Port Royale, I will find somewhere demo :) and Empire Earth I have boxed version of every game (EE1 gold,EE 2 gold,EE3)

Well, Arcanum isn't going up in price any time soon. So from that standpoint alone Spellforce is looking to be your best bet. I do like Arcanum's setting, but its lack of polish is off-putting given the amount of hours it demands.

According to this thread, here's a demo.
(BTW, this is how it usually goes here: you ask for our opinion in a choice of two games, and you get flooded with suggestions :-D.)

I sorta like that, I've actually purchased a few games reading threads like this . . . =)

I tried both arcanum and spellforce in quick run and I must say than unfortunately spellforce isnt what I am looking for right now...so I just wanted to ask which game I should pick : Arcanum or Fallout 2 or you suggest something more (I tried Port Royale, but I am looking for little more action right now :) )

Yup, I know you're like that :-).
I'd say go with Fallout 2. Although they are both great games, F2 enjoyed more love from the community, which led to it having a gazillion minor mods for it, and a couple of large-scale ones.

I was in middle of Fallout 1 and absolutely loved it few years back and now i downloaded it again, I heard that Fallout has even better gameplay. And I will be strapped of money for long time so I want to have Fallout 2 on shelf just in case.