I am looking for a comparison of materials with high strength-to-weight ratios, is there a website or otehr publication that may help me find and compare materials that fit my criteria?
You can perform property searches using matweb. MIL-HDBK-5H is a great source of information on high strength materials. The following links should get you started:
While you're at it, probe strength to wt at various oper temps. At certain temps the advantage crosses over from material to material. GE had a chart that showed strength to wt vs. temp, which is enlightening.