Let me second this recommendation that anyone with a genuine interest in this topic check out The Algebraist; it's a truly excellent book. I wouldn't say it's Hard SF but it's pretty firm and, IMO, a far more considered and imaginative vision of viable-ish space battle than the linked article manages.

I mean, the article hardly even mentions antimatter, aka the most potent energy store in the known physical universe, aka God's battery. Who's going to be frigging around with some stupid dirty fission reactor when the local Dyson Sphere is producing cheap (by military standards) AM by the kilo?