D7100 Memory Card Test - YouTube
What you are looking for is at 4:30. This IS the best card you can get for the D7100 I have seen them as low as $35 and as high as $70. I had two of them in my D7100 right now.
If you are shooting JPG ONLY buffer issues do not come into play. Without watching the video again while typing this, JPG only is going to average you about 50 JPG’s in 10 seconds IF you are using a higher quality card.
I think this can be achieved (for JPG only) buy buying a cheaper card other than the Extreme Pro you would have to watch the video and see which one fits your needs.
If you want a camera with a 1.5 sensor and do not own a D7000, this would be the camera to get. I have read most people who do own a D7000 do not feel a need to upgrade to the D7100.
I moved up from a D90, which has the same sensor as the D300, I think it was a great move for me, night and day difference in picture quality.
If your looking to move into a D7100 for a 1.5 sensor seeing how you have full frame already you going to have to accept or work around the fact that your are going to have buffer issues with it when you “motor drive” while shooting RAW. It is my understanding that the D7000 has similar or the same buffer issues when shooting RAW I don’t know I don’t own one.
To sum it all up for anyone else reading this and thinking about the D7100, let me put is in simple terms for you.
If you are a JPG shooter only, buffer issues should not be an issue with a higher-class card. If you shoot RAW and like to “Spray and pray” the D7100 might not be for you.
If you are wildlife photographer and shoot RAW you’re going to have to time your shots a little differently or move into a full frame camera which that buffer can handle more continuous shooting than the D7100 can. Again based on you style or skill level this camera may not be for you.
You other choice is to wait for the next DX body to come out, be it a replacement to the D7100 or the long awaited (my never happen) replacement to the D300 and hope Nikon addresses the buffer issues in RAW mode.