I get it...in that case, I'd say keep Ovie/Kane/Parise/Kopitar/Markov/Fleury.
Ovie, Kane, and Parise would be the three previous keeper skaters I'd keep. They'd be the first ones to go in a draft next year and are pretty much guaranteed to be high-end players next year, too.
Kopitar is a great, top notch center and would certainly go higher in a draft -- at least at this point in time -- than RNH.
Markov is a little bit of a risk given his health history...but he's been healthy so far this year (even with the condensed schedule) and is playing great on a good Canadiens team. Unless he has more injury issues between now and the off-season, he'll be among the top-ranked defensman in next year's draft.
If you're not comfortable keeping Markov, then I'd say Tarasenko would be the best bet among the remaining eligible players.