Will an undergrad degree from a mediocre school crush my econ grad hopes?

[Joe001]

working on a BS in Economics and a Math minor at UT-Arlington.  Yeah it's not a great school.  I'm wondering how this will affect my chances if I should so choose to attend grad school.  I have no illusions; I'm not nearly smart enough to get into a top program but at a decent program, perhaps somewhere in the 50-75 range, I would like to think I would have a chance at a place like that.  My grades should be good, my GRE scores should be fine (probably not stellar but somewhere around the median at schools I would apply to) and having a math minor means I have some familiarity with some of the math that is used in econ.  What do you guys think?  Should I worry more about other things that I can do to improve my application, like working with a prof as a research assistant or something, rather than the things I can't change?  Or should I seriously reconsider attempting grad school?