1. Rome Total War (Very moddable, good graphics/gameplay balance, spent sooooo much time modding it, massive replay value)
2. Mount & Blade (Epic moddability, brilliantly designed combat engine)
3. Age of Mythology (Favourite RTS, definitely a classic of the genre)
4. Civilisation II (My first ever computer game, also still a challenging and interesting strategy title to this day)
5. Adventures of Soros (Not a good game really - just feels rewarding playing a game and thinking "I made this")