You're not going to have problems with rod strength as long as it's an A2, it's the A3's with weak bottom ends. As for the oil pump, stock is fine as well there, you think honda would put it in a motor revving to 8k if it were junk?
K-pro = Win, was the best money I ever spent on my EP. As far as headers, it's generally the BCRH that people see the best gains with, although a Jackson racing RH isn't too far off the mark. There may be others, as well but those seem to be the two most popular. You have to be really careful when porting a K series head, as the intake and exhaust runners have weird designs to them, I'd invest that money in a good set of cams, myself.