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You can match the CF cards performance with an SD card up to 42 MB/s. Which is the 60MB/s CF cards. So can the SD card bottleneck performance? Absolutely, because they don't make 1000x SD cards in the first place. So pairing a 1000x CF card with a 400x anything, whether it's a CF card or SD is going to bottleneck your performance. That's just how these things work.
albeit at the lower SD card speeds
With repsect to the D800, I will most likely shoot sports in DX mode and get a 15MP JPG image and 5FPS (theoretical) out of the camera as compared to the D300 12MP image and 6FPS. I'm not a professional, so while I might miss some shots, it's not a killer. This also gives me the option of switching to FX mode when the AF-S Nikkor 70-200mm f/2.8 VR II w/o or w/ mated TC-14E 1.4x or TC-20E 2.0x teleconverter is 'too much lens'. Then I will get 36MP JPG at 4FPS. For all other work, it will be FX mode in either RAW or JPG images.
It's not slower if you match the speeds. Again, they don't make 1000x SD cards.
All this card speed moaning, and you plan on shooting in JPEG? Are you serious?
File size should not be an issue with todays modern computers. If you HD isn't up to it, get on of these
Amazon.com: WD Elements 2 TB USB 2.0 Desktop External Hard Drive: Electronics
Get a D4 or a D3s then and call it a day.
What I would do: Get the D600 and take the extra money and invest in a good piece of glass. The glass will last forever. The camera is a very nice camera, but will eventually age. Based on what you said you do with it, the D600 will do all that and more. JMHO..