Which fish to get? and Which fish to rehome?

[cooper.s]

Hey All.
Basically ive got a fair few fish atm which are as follows.

1x Fire Eel
2x Columbian Sharks / Cat Sharks
1x Black Ghost Knife
1x Common Pleco
1x Royal Whiptail Catfish
1x Black Lancer Catfish
1x Synodontis
2x Moonlight Gouramis
5x Silver Sharks
1x Pangasius
2x Pim Pictus Cats

But to be fair they bore the hell out of me so im planning on taking some back to the LFS and trading them in for some better more active fish.

Fish im thinking of rehoming are the silver sharks the gouramis and the pim pictus and maybe the pangasius

But what can I replace them with????

I have a 120 gallon tank and im in the process of gettin my hands on an FX5 filter.

So people, what fish shall i get my hands on and which 1s do u suggest I rehome?

Thanks
Sean