How about Katsidis & a former Chico rival, "Grandpa" Garcia? I always liked this guy. Garcia helped launch the young Corrales, giving him his first world title, during a fun little scrap back in (I think) 1999, or maybe very early 2000. Garcia was a good, competent fighter, but nothing really special. He & Katsidis may be more on the level.
I think Kat would be a bit too big and strong for Garcia, who wasnt a guy suited to do anything above 130. I'd favor him to grind Grandpa down for a late TKO. I dunno why I did this matchup, perhaps I was feelin a bit sadistic. Kat is made in heaven for Chico, and I'd be kinda shocked if Kat lasted more then 5 rounds. He simply doesnt have the chin to walk through Chico's firepower. A more even matchup, as Neil suggested, would be Kat vs Manfredy.