Personally assault freak, I'd highly recommend you get Soul blade for the Ps1 and play it on your Ps2. While i'm sure you can mame soul edge (only the console release was called soul Blade), the console game had loads of really nice features.
firstly, several extra chars, and unlockables, such as Han Sung myong, Sunmina's dad and Whang's master, evil sigfreed, and the chance to play as the boss, a Cervantes posessed by Sould edge.
the game also had video endings with propper acting, and each char would have two endings, one reached by putting in an unlock code at the right time.
Then, the major thing in the game was the storry mode. unlike in soul Calibur 2, the game had a unique story mdoe for each char, telling his or her own story, and collecting his/her s weapons on the way. Imho this tied things together a lot better than the random fantasy esque story set in a weerd world that you get in Sc2. Also, i did rather like the fact that a lot of 16th century genuine history gets into the story, such as the Japanese rades on the northern Chinese coast, and the problems of river bandits on the Yangsee river.
I was actually slightly disappointed with the story mode in Sc2 in this respect.
Everything's of course available on good old Gamefaqs, ----- though to save you the bother of looking up Soul blade I could always E-mail you my transcript of the story mode aka Edge master mode if you like.
As to old consoles, well while the MEga drive stopped being a viable console in about 1994, the Snes was actually having new games produced for it right up until 1996, a year after the Playstation's release. There's even a scene in Donkey Kong country 3 where a character is playing a nintendo 64.
Personally, I always go for what game's are available on a machine, and the snes and Mega drive had some absolutely fantastic ones, ----- some of which i've not yet tracked down myself.
As to street fighter, that's another reason i'm considdering bying a Ps2, ----- the Street fighter aniversery collection! That game series is cool, ----- and also has a great plot (see the appropriate plot faq on gamefaqs for details).
With our dreaming and singing, Ceaseless and sorrowless we! The glory about us clinging Of the glorious futures we see,
Our souls with high music ringing; O men! It must ever be
That we dwell in our dreaming and singing, A little apart from ye. (Arthur O'Shaughnessy 1873.)