Originally posted by: Chaoskiddo
oh. well then, funny. then the vaizards arent necessarily the bad guys. and i guess the 3 that have enough spirit level to not be trash is urahara, yoruichi and isshin, because i think uru..blah called ichigo trash. but then again they shouldnt know about isshin.

its definetly
1. urahara
2. yoruichi
3. isshin/ichigo.

They were actually referring to 4 people. If you read the chapter again vegeta said something along the lines of "We are here to capture him. I heard there are only three others with spirit pressures high enough to be dangerous" So we know they were going after Ichigo, the three others must be Urahara, Yoruichi and Isshin.