My lines are basically identical to Spawn's
I'd go:
Maroon - McDavid - Drai
Lucic - RNH - Ebs
Pouliot - Desharnais - Pakarinen
Khaira - Letestu - Kassian
ex: Slepyshev, Hendricks
Klefbom - Larsson
Sekera - Russell
Nurse - Benning
ex: Gryba
Talbot
Brossoit
So first off I'm not sure that Desharnais is actually capable of outperforming Letestu and may be more suited to the 4th line, but he's new to the team so try to get him off on the right foot.
Reason for Pakarinen over Slepyshev is primarily PK related, while I think Slepyshev could PK the fact he has got no PK time in the past 2 seasons I'd rather not lean on him for it at this stage of the season. Pakarinen himself hasn't been on the PK this year, but was a regular last year and can take Hendricks PK mins. Pakarinen is also a right handed shot which is in short supply, they are good arguments for each, it's just we need a minimum of 6 PK forwards and figured it was the best compromise.
I have Khaira in the line-up over Slepyshev and Caggiula not cause he is the best forward of the bunch, it's cause the guy just wins puck battles plain & simple and cause of it he helps drive possession time in the opposition end. If you can have a 4th line that is just capable of hemming the opposition in, that is generally quite ideal even if they aren't chipping in much offense. A 4th line that can win the territorial battle regularly, particularly in the playoffs tends to be a godsend.
Caggiula is damn close to getting consideration over others, but he just seems like a little AHL polish with a lot of playing time is what he really needs for his long term development. I think a Caggiula - Lander- Puljujarvi line in the AHL would be extremely strong and make for a really strong playoff push down there, it would also be a strong bookend to Caggiula and Pulju's seasons and if they can just dominate down there and come up next year with a lot of confidence & a hunger to stick in the NHL, that would be ideal.