j0ekerr: Fellow goggers, recommend me some games on the absolute cheapest end of the catalog.
Age of Wonders 1 has insane gameplay value compared to its price (plus it's more simplistic than later entries, which could serve as a gateway to the series without being overwhelmed by the mechanics) .
Dungeon Keeper 1 and 2 are great games with insane replay value (DK1 is slightly better if you can stomach it's graphics).
FEAR platinum is another great game, one of the few games that gets the horror aspect right. Also it has great game design in general (bullet time, enemy AI, psychic powers).
Sacrifice is a great pick ,graphics are outdated but its gameplay is great and there's literally no other game like this (only Overlord 1&2 have some slight similarities).
Also since the flash sales recycle themselves, you could wait for a potential resale of Shadowrun: Dragonfall, it's an insane turn-based RPG and by far the best of the modern adaptations.
j0ekerr: Should I get some ultima games, or maybe the first thief games? I still don't have AoW2, should I change that? And what about "The saboteur"? It does look nice.
Honestly, the ultima games are way too outdated IMHO. I tried to get into Ultima 7 once in the past (it's the most newbie-friendly game of the ultima series) and just uninstalled after a week without second-thought. If you have much patience you might get around its shortcomings.
About AoW2, check my point about AoW1 and if it turns out that you like it then wait for the next sale to buy the next installment.
Thief games are pretty good. By far the best stealth mechanics, and if graphics turn you off there are many graphical mods to fix that problem.
The saboteur is worth, for its current price. It's fun but it gets repetitive really fast. Still, it's fun for the first few hours so for this price it's good.