Threshold is a great band (I could easily see them accompanying SX on tour), and I agree that their music could find a wider audience if given the proper exposure...
Either Hypothetical or Critical Mass is going to be my next album purchase. I've been digging these guy's 2 songs "Light and Space" and "Falling Away" for a while now. Just haven't gotten the justification to spend the dough yet.
All of their albums are worthy to purchase but my fave is still my first intro to the band which is Extinct Instinct with Damian Wilson on vocals. It's probably their most progressive too.