For sure: Murrue Ramius of Gundam Seed/ GS Destiny
I love her and have been wanting to cosplay as Murrue forever, but due to my vastly insufficient sewing skills I've finally cracked and have commissioned her EAF uniform.
BUT
I've been seriously kicking around additional cosplays as
Dusty Gozongas (City Worker from Aquateen Hunger Force) and Lucy T. S. (Bar Singer from Avenue Q) since blondes have more fun.
And both bombshells would only need one wig and minimal sewing effort (dusty:none, lucy;easy blue top and skirt)...
though both of those lovely ladies would probably only be seen after curfew due to their minimal monetary investment, smaller crowd recognition, and dubious nature.