Why not David Weber's Honor Harrington series...
Would depend on how well it was done of course. Hard to depict those huge space battles well.
Still, lots of fun stuff in those books; powered combat armor, gigantic spaceships fighting in formation, enemies that are truly evil and nasty... and a potentially cute sidekick in the treecat. Unfortunately you
know they would just turn the treecat into a mindless cuddly thing...
Or else I wish they'd just do Starship Troopers the way it was supposed to be, with the Mobile Infantry fighting in powered armour suits capable of jumping over buildings etc.
Oh, and isn't it about time someone made a Mechwarrior movie?