GLi has lesser torque than both Si and Vti.
Si or Vti would definitely out perform GLi
Reason:
1) GLi is SOHC - No Vtec. It's just a normal single cam car and that's it.
2) Si is DOHC - No Vtec. Think about 2 human beings competing in a race. One using 1 leg to run (GLi) another using 2 legs (Si) to run. Who would most likely be the winner?

Comparing between specs Vs specs, it is apparent that Si can do much better than GLi.

If we are comparing between stock to stock Si and Vti, I think both would be go on par. It depends on what kind of performance and characteristic you want from your car. Vti would definitely gives you that slight push when Vtec kicks in at 5200. However, Si provides you with constant power with torque till the red line.

I reckon that you should do more test drive with GLi, Si and Vti in order to know and feel what suits you the best.

I personally think that Si is the best.. :P Because I am driving one!