I believe that's right. Except the Power Commanders can also subtract fuel, which I don't think the Dobeck-style units can. Plus, they can run full fuel maps like a car, complete with TPS inputs. Correct me if I'm wrong, but the Dobeck/HMF units can't do that.
Between Power Commanders, I would get the 5. I DON'T have any of these units, so I'm just going off what I've read. But the 5 is significantly smaller, and can run an Autotune if you wanted to expand in the future. To me, that's the way to go.
08 700XX (Gray, L8ton Racing Stealth Bumper, 13 tooth, 21" Razr2 fronts, stock rears, Precision Pro stabilizer, Fox Evols and Podium Xs, Teixeira Tech stock-length upper A-arms, Teixeira Tech stem, L8ton Racing 9/16ths sway bar, ProTaper Contour bar, Shock & Vibe clamps, EHS lid & programmer, HID headlights)
08 Outlander 800
08 Yamaha Big Bear 400 4x4