We have Savvis as one of our providers, we are in Equinix Chicago. LayeredTech is in a Savvis DC in Texas, though I am not sure whether they do colocation services.
Are you looking for space inside a Savvis DC or just Savvis bandwidth?
Savvis charges a premium to get bandwidth inside their facilities. Let me know exactly what you are looking for, we can resell direct Savvis lines and also inside the Savvis controlled DCs