Editing Warhammer 40,000/7th Edition Tactics/Space Marines (section)

====About Deathstars and retinue====
Super Killy squads usually don't want badass mofo characters, they just want force multiplier characters. Badass mofo characters don't want elite retinues. They just want meatshields. By giving both squads what is most efficient, you end up with two high level threats instead of one.

Honesty, don't use a Death Star. Just don't.
It's a nice unit that will do damage to another unit, maybe 2. But against a fully balanced army then they really won't have a chance. Too many points stacked up in one unit.
Take 2-3 units that will have more specific jobs instead of 1 all rounder.
Example: Command squad on bikes with chapter master with shield eternal, thunder hammer, apothecary, and 2-3 special weapons (grav really, maybe melta). You've got some to take wounds, you can jink, you get an orbital bombardment on a fast moving killing machine, and T5 with FNP. And not TOO many points. Alongside that run an assault termie unit with thunder hammers and storm shields. Thirdly, run 10 assault marines lead by a captain with burning blade and storm shield. All of that comes in at just over 1,000 points, with no troops. So you'll still get two good tac squads in there and a vindicator or something like that at 1500 points.