I cant imagine a GF4 Ti4600 costing 500$ american let alone that much more when you do the conversion...here a GF4 Ti4600 was perhaps 350 at its absolute highest...
I had a Parhelia for a week... got to install it..tinker... benchmark and send it back to my buddy who didnt want to do the benchmarking...
It wasnt all together pathetic... tri display where cool...but it was not a stable card...and it was and is over-priced... the Quadro multi-heads where out and cost MUCH less money... the OpenGL quality/drivers/etc where poor...the 2D was great but not much differant then an Nvidia/ATI...
I think Matrox is almost done as a card company... from the G550 onward they have been stumbleing...