I'd recommend visiting W&L. If you could picture yourself in a small town for 3 years, I would take W&L over Fordham (keeping in mind your goal of DC over New York). Fordham is a great school, but my impression is that it loses a bit of its prestige outside of NY.
I guess you could try to get some money from GW, but I don't know how likely that would be. GW is a great school, especially for DC. That being said, I don't think its placement is substantially greater than W&L's in DC (though it definitely allows for greater networking opportunities). I think an extra 60k plus living expenses is a stiff price to pay for marginally better prospects.
If you want to be in DC, I don't think Temple is the way to go. However, it is a fine school, and a full ride is nothing to sneeze at--especially if you aren't interested in biglaw (hopefully it will still exist when you graduate). Factoring in your scholarship at W&L,and increased living expenses of living in Philly, I'd imagine you are only saving about 10k a year by choosing Temple over W&L.
To summarize, I'd probably go to W&L, if you think you can handle living in a small town. All pretty good choices to have though, can't really go terribly wrong. I guess I should note that I go to W&L, so I may be biased.