Totally agree with your player choices. Holiday actually had great stats against the Suns in the Friday game. 14 pts, 7bds. and 6 assists in about 30 min. Kind of indicates he's ready to play now, which bodes well for the Sixers.
Speights fits in well with the running game, and he also manages to make shots from the outside. Replacing Dalembert with him in the lineup would improve the Sixers offensive effectiveness. I think it's only a matter of time, now that Speights managed 12 boards along with his 32 points.
Let's also not forget to include Lou Williams putting up 27, that's not something you could expect from Andre Miller. Lou should be getting more assists, but I noticed that Nash got assists for passing to another player to hit an outside shot. The Sixers don't have a lot of outside shooters to make that easy pass to. If everyone dribbles after you pass the ball, no assists.
I'd like to see a more consistent effort, and particularly try to find a way to stop the Suns from running, or at least slow them down. Cutting down on their turnovers would also help the Sixers cause. I expect a better game from Brand and Iguodala and am leaning towards a Sixers win. Thad is still finding his way, but I'd like to see more out of him too, he's one player I'm looking for to see a big improvement from in outside shooting.