Darn, I didn't notice this thread early enough to really help, but....
I'd suggest d20 Cyberscape, out of those options. While a few things aren't explained quite well enough IMO, and the VRnet/HInet sections are kinda lacking (I likes me some Shadowrun), the book is reasonably well-packed with useful and detailed stuff, though a few bits and pieces really aren't worthwhile (a lot of extremely limited or extremely weak implants and such, plus the rules for prosthetic limbs are kinda weak). There's a lot in there that's useable as-is and will help a d20 Modern game better emulate postmodern or superspy settings.
Also, the book has several options and variants, as well as a chapter on alternate cyber-stuff, such as golemtech, necrotics, wetware, and stuff. There's just a tiny bit of nanotech-related stuff along with it. And it has stats for old-fashioned prosthetics like a peg leg or hook hand. ^_^
D20 Future Tech is alright, and certainly useful when running a game involving starships, mecha, or robots, but otherwise it's a mixed bag. LOTS of semi- or totally-broken bits and pieces, and some very incomplete descriptions for some stuff (for example, there's absolutely no description of what Psi-Tech is or how it's supposed to work, though much of it seems just outright better than anything else, so it sure seems like they forgot to detail any kind of requirements or limitations for it).