Vantage skews results between systems like there is no tomorrow. It is hard to compare systems as the REAL WORLD results are always different in games. It is handy if you are upgrading one component in your system, or comparing identical systems with one or two different parts, such as in Hardware reviews.
Your first like says you are using an email@example.com GHz (wasn't sure if that was correct as your member config says i7 920). The next link is an e8400@3GHz. These scores are similar, which is probably pretty correct. However, the last link uses an firstname.lastname@example.org GHz and DOES have (2) 5770's. Notice under "Linked Display Adapters" it says YES. That is the tell of a Multi-GPU setup.
A key thing to remember in 3D Vantage is that multiple GPUs are not seperated and cause skewing of data. I had this problem when I was first trying to compare my system. Based on your CPU and GPU your score does seem appropirate. I have 10431 with I7920@2.66 and ATI 5850 (http://service.futuremark.com/compare?3dmv=2087733)