http://www.discodsp.com/discovery/

the only vst i can truly reccomend that delivers such a full sound.

pro 53 is good though, ive found the discovery to sound really full and analogy and still sounds full along side my virus (its very much like a nord lead) so much so itll accept nord patches.

i hate the vanguard with a passion, its good for bass but leads tend to sound so cold and sharp, really digital sounding.
they stand out a mile in tracks aswell.

if you want to make trance with rich sounding synths then the discovery is the way to go software wise imo .

check out absynth aswell if you want to delive into slightly more complex synthesis options.