Yeah, I heard it's a great game, so I bought the full package for less than a buck (one of the advantages of living in Russia. Серьёзно, полный пакет стоит полтинник, в то время, как, например, у британцев он стоит 240 рублей по курсу). I also heard that the first SF has yet unsolved shadows bug on the modern machines, maybe you could look into that.
Yeah, it's very good game. I don't know the standalone addons, but I really enjoyed playing SF1 Platinium and SF2 Gold. SF1 also lacks widescreen support.