Nikon camera preference?

I'm looking at getting an additional camera to my Nikon D90. D700 and D800 are currently too expensive for me. The options I now have are D7000 and D300. They are on the affordable range for me. My intention is to expand professionally that is covering events e.g. Weddings, birthdays and other events. I might also cover studio photography as well. Can anyone please advise me on the options D300 and D7000. Which one would you recommend i go for?

Both the D7000 and D300 are good choices. The D300 is more robust however the D7000 is more advanced and performs better under low light.