To be honest with you I would not even consider a Vision + but instead go for one of the P3's now that's my opinion.
As for the P2 non-vision prices have come down over the years and right now from www.bhphotovideo.com you buy a P2 with H4-3D gimbal for $399.00. Of course it was designed around the GoPro camera and to fully out fit it with a FPV system would run between say $250 to $350 depending on what manufactures equipment and who you but it from. A complete system consist of a 5.8GHz video transmitter. mini iOSD plug n play and a diversity monitor/receiver.
Repair options should be something to consider if it's your first.
The cost to replace P3 gimbal and camera vs the cost to replace a H4 or H3D gimbal are a bit different.
If you had a bad crash, most I've seen the camera survives but the gimbal is badly damaged, so your replacement costs will be lower. Of course the video from the P3 is a bit better than what you can get with a go-pro H4.
Depends on your budget I guess.