The gopro will give better images in general, but not by a huge margin. If the vision's images bug you that much, you may not find satisfaction in what the gopro produces. However, in the right conditions the gopro can give you some stunning images that are suitable for most professional and other online uses.
If you're not going to put up anything heavier than a gopro, you probably don't have any need to move to something like the 550. If all you're doing is pictures (no video) and can do without a gimbal, you can get some great flight times (12 min +) out of even the P1 with just a gopro and FPV. If you do end up needing a little more lifting power, you can move to a 550 or something similar for less than you're thinking. I built mine using a Wookong flight controller ($1000) instead of a NAZA, and I still kept it to just over $1600, including FPV but before the batteries...you could get a 550 going with a NAZA for less than what I paid for the Wookong alone.