I think the pikes are pretty variable in terms of personality, as the amphilophus can be as well. Like you said, some are calm, the majority are pretty aggressive, some are psycho. I have seen pikes which hid all day. I have had a large johanna who did not hide much, but mostly "chilled" and wasn't particularly active. My pikes that I currently have, are crazy active and devour anything that touches the water including pellets, begging for more when I stop dropping them in.
I think a wild Oscar sounds like the best fit of the options to me. Would be a nice addition.
Im just going to have to wait until someone gets some in that I would like. Years back Wet Spot had crassipinnis and Rapps had the orbicularis but now the market is pretty much devoid of good looking wild caughts. i would even take a red bahia oscar....
Right now Wet spot has wc 'Columbia' which I have no idea what they look like as adults and Rapps has "Orinoco" which I guess look dark and bland when grown. So I will patiently wait for a wild caught variant I want