Please note that the calculations above do not include the Phantom 2 you are upgrading.
People tend to think the P2V+ is "crap" because the gimbal is a bit flimsy, and prone to break on impact. And really expensive to replace. In summary, the P2V and P2V+ have RAW (DNG) capabilities which make them a bit better for still photos, but the P2 with all the bells and whistles including a GoPro Hero 3+ will tend to produce better videos: 1080p@60 and 2.7K@30.
If you were to upgrade a Phantom 2 to same capabilities, you would need a mini OSD and dedicated FPV on ground, and the dedicated Ground Station. A Zenmuse H3-3D and a GoPro Hero 3+. Give and take.