I'm guessing you heard "Seven Cities" by Solarstone? classic track... anyway, for that style of pure trance, I recommend getting hold of the old Ministry of Sound Trance Nation Albums - you should be able to download them without too many difficulties (try BitTorrent). The early Global Underground albums are *amazing*, particularly Tony de Vit in Tokyo and Sasha in Ibiza, but the former will probably be a bit too hard and the latter slightly too deep at this stage.
Also, have a look at the livesets on tranceaddict.com. you'd probably really enjoy the GTR, Thrillseekers, Paul van Dyk and Robert Gitelman mixes.
other DJs to look out for: Signum (Ron Hagen & Pascal M.), Tiesto, Misja Helsloot, Rob Tissera, Guy Ornadel, John '00' Fleming, Ferry Corsten, Armin van Buuren, Pulsedriver, Paul Oakenfold, Dave Pearce, Scott Bond, Ronski Speed, Dumonde, the list goes on...
if you decide that you want harder stuff then post back for advice. if you're anything like me then the more you explore the harder you'll want to go. Aphex, that Mark EG set is pretty impressive and I normally prefer freeform/hardcore to hardstyle...
trance will never die