Waves Audio Codex Wavetable Synth by coolfog09
Codex is one of a growing number of VST instruments being offered by Waves. Version 9 runs with perfect snapiness on my workstation.
Here is an in depth video review:
Without any added effects you get a really nice sounding plug in with lots of variability. For new users it is not the easiest to get your head around this if you are not used to the concepts of sound creation.
With a bit of work you can soon tell this has some powerful flexibility.