A critical technology for Grid computing is the ability to describe, select, and bind appropriate resources for synchronous use by applications. Our Virtual Grid Description Language (vgDL) allows applications to describe and manage resources conveniently via application-level abstractions and enables a novel approach to application-driven resource management called "finding and binding". We explore the viability of this strategy to enables applications to obtain complex resource collections in competitive resource environments. Our evaluation shows that combined resource "selection and binding" can scale well to millions of hosts, identifying good matches in a few seconds for the most complex resource requests. The combined selection and binding improves success rates for complex requests and the advantage increases for more complex requests and higher resource competition. Combined Selection and Binding can double the resource utilization (from 30\\% to 70\\%) at which synchronous resource allocation and use across as many as sixteen resource managers is possible.