Sounds like your average "Trance" Synth. Sawtooth lead with plenty of voices and their usually detuned to create that thick sound. Basically it's that "Supersaw" your after. Dial-UP the Cuttoff Freq pretty high or maybe also try HighPass Filter.
If you want a VSTi synth that can create that sound. Try some freeware synths such as:
SuperWaveP8 (
http://home.btconnect.com/christopherg/main.htm) It's supposed to be an emulation of the Roland JP8000.
Also try "Lallapallooza lite." (
http://www.kvraudio.com/get/719.html)
Those should help you out, preset wise. Commercial wise, I'll probably roll with a VST like Pro-53, Vanguard, V-Station or Discovery.