That being said I want to deter from the Randolph bench issue.
I want to talk about how you think your team matches up against Dwight Howard. Is Dampier still enough of a force to keep him out of the paint?
Also, how do you hide Derrick Rose's awful man defense. Chicago did it last year with Kerk Heinrich. Do you see Lee as your Heinrich?
Any player in the NBA is going to struggle against Howard, I think. Even Perk, one of the best defenders in the NBA, gave up games of 32, 30, and 28 points against Howard. However, Dampier can slow him down -- Dallas' defense was appreciably better when Dampier was in the game last year, and Dampier has the size and muscle to make Howard work.
The biggest worry from Howard isn't his offense so much (Bargnani scored almost as much, for instance), but his defense and his rebounding. Sacramento mitigates that rebounding advantage by having four of the top 22 rebounders in the NBA in terms of rebound rate, and two of the top five rebounders overall. That's going to be huge in matching up against Phoenix. Also, while Howard will always be a good defender, the fact that Sacramento's offense has two big men to stop, rather than just one like most teams, will make it harder for Phoenix to shut us down.
Regarding Rose, his defense was somewhat average for part of last season, but was much better after the all-star break last year, and by all indications, he's made another leap in that area this summer. He's always had the physical tools to be a great defender; he's finally starting to learn how to be consistently aggressive to the point of being disruptive on the defensive end. (No PG defender in the league can consistently shut down his opponent, but Rose has the skills to make PGs work.)
Also, I think Garcia and Lee are both very good backcourt pairings for Rose, as they're both guys who play hard, are good defensively, and who are willing to do the dirty work necessary to win without complaining.