Lucic Krejci Iginla
Yeti Bergeron Loui
Marchand Spooner Kelly
Paille Campbell Smith
I like that lineup... although i'm not sure Reilly Smith has done anything to deserve a demotion from the 2nd line to the 4th line, at least not yet.
I wouldn't mind seeing the Smith-Bergy-Eriksson line back together for a period to see if they can pick up where they left off. I feel like they were just starting to really gel as a group when Loui got injured.
They weren't quite lighting up the scoreboard, but the chemistry seemed to be building and the chances were there. Too early to see how that line would/will pan out.
Still, overall i like your proposed lineup and i'd suggest as a possible alternative:
KIL
Smith-Bergy-Eriksson*
Soderberg-Spooner-Marchand*
Paille-Kelly-Campbell
**Marchand and Smith could be swapped back and forth over the course of the season.
Soderberg-Spooner-Smith might be a quality 3rd line which would allow Brad to play with Bergy/Eriksson on the 2nd (at least once he finds his game)... but Spooner would have to demonstrate himself as an established fixture at 3rd line center for that proposed S/S/S lineup to work.
We shall see. All of these lineups assume that Caron and Thornton will be the "odd men out" should Spooner prove he belongs and once Eriksson is ready for regular minutes again on the 2nd line.
I find myself appreciating what Loui Eriksson brought/brings to the table now that we've seen an obvious decline in the 2nd line's performance after we lost him. He was playing well with Bergy and looked like their chemistry was only improving as the early season progressed.
Sometimes you don't appreciate players (or anything in life, for that matter) as much until you see how things pan out once they are gone.
IMO Smith has been a pleasant surprise to come out of the Seguin trade. I like what the kid brings as a top-9 forward, but putting him on the 4th line should not automatically be out of the question... at least not yet.