The Smartstrand Silk carpet, while being very stain resistant, is extremely soft, and will show every vacuum mark and footprint.  If this does not bother you , then go for it. 
Gulistan makes some very good carpets, and their new Stainmaster products in Luxurell fiber are outstanding.  It will show a little less footprints because the yarn is not as bright as the Silk fiber.

Good Luck,
Jim