I'd still love to see more of a Holloway-McLeod-Foegele line. If you can get a very fast line like that going then a top 6 winger addition is an obvious choice.
Konecny would probably my top target if he was available especially with him having a 2nd year left on his deal. I'd give up 2 1sts and a prospect not on the roster for 50% retention. Would basically fill a spot for next year that you don't need to add at the deadline. Not really sure why the Flyers would deal him though.
Guentzel, Tarasenko or Jenner would be my next targets depending on the price. I'm becoming less and less inclined to look for a Ceci upgrade whereas I previously was. The market of RHD outside of Tanev (who obviously carries injury risk and is starting to slow down) is very marginal upgrades on Ceci. Nurse is also playing very well with him this year so I don't know if its worth finding him a new partner.