The Clown Knife can get around 2.5-3ft. Anything small enough to fit in its mouth at that size is done. I doubt if it will try an aggressive cichlid but you would have to be careful. It will also need a really big tank, bigger than your 150. I don't know how long a Wolf and Loiselli would make it. It could work because they have two different behaviors. Of all your choices I think the Jag pair is the best choice.
If i had a choice i would keep the loiselli, ck, and wolf. My resoning behind this is because the ck was a gift from my fiance, the wolf is a cool fish that I've always loved. and the loiselli is a great looking and hard to find fish. U get the jag attitude without the extra size
he said it was going to be a grow out tank but i think it would be over stocked even for small fishies but I would go with the first choice with the wolf cichlid