If you call customer service and ask for a CLI, they will ask about your current income, place you on hold while they check your file, and then will tell you what they can increase your limit to. I think you need to get to 5k for the visa.
Current:
TU 04(4/24/13): 766 (No Inquiries)
EQ (4/15/13): 780 (No Inquiries);
EX (4/16/13): 770 (Inquiries: 9/9/11; 7/2/12; 11/20/12) - freecreditreport.com
Goal: No inquiries for 2013, 750 for all CRs by 12/31/13
