WRs Help for Week 13?

I got 5 WRs...Lance Moore, Cotchery, Fitzgerald, Berrian & Plaxico, I really need to win on Week 13th...I trust on Fitz, Moore, Cotchery...but I'm confused about Plaxico & Berrian, do I sign a free agent like Hines Ward or Vincent Jackson in order to get some real points? Do I keep them? HELP PLEASE