What are the best games I can play on my computer that has these specs?

Im particulary interested in strategy games like the old command %26amp; conquers etc, but I like shooter type games too.

I just tried to run age of empires 3 and it wouldn't run properly. It needs a 64mb video card and according to that I only have a 32mb card.

Heres the rest of the specs from what I gather:

vista home basic

503mb RAM

1.70 GHz processor

120gb harddrive

What are the best games I can play on my computer that has these specs?
lots my children go to games and stuff all the time i don't know where to get started...warcraft...Diablo1..2...war hammer..and if you don't want to buy anything heavy-games have millions of games.What are the best games I can play on my computer that has these specs?
I'm not a PC expert but i know the game Spore can run on even the crappiest of PCs (like mine).What are the best games I can play on my computer that has these specs?
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