Only US Citizens can file I-129F for K-Visas, You being a permanent citizen can marry her and then only file I-130 for F2A IR-Visa and will have to wait some time for a visa number to be issued.
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Family Second Preference (F2): Spouses, minor children, and unmarried sons and daughters (over age 20) of lawful permanent residents. (114,200) At least seventy-seven percent of all visas available for this category will go to the spouses and children; the remainder will be allocated to unmarried sons and daughters.
http://travel.state.gov/visa/immigrants/ty...types_1306.htmlCurrently processing F2A cases filed March 2003.
http://travel.state.gov/visa/frvi/bulletin...letin_3925.htmlThis can be bumped up to IR class when you naturalize and become a US Citizen.