Wedding Photography: Nikon Cameras?

As someone who is getting into the wedding photography business I'm trying to decide which second camera I should purchase (I currently own the Nikon D5000). My question is: do I just get a second D5000 camera, since it's suited me well thus far, or is it worth investing in the more expensive D300s or D90 camera? Part of me thinks I should get a real "semi-professional camera" if I want to be be in the business, but I'm just not clear on what the real advantage is to those cameras since I've been really happy with the D5000.

Look at the D90 since you can use the 50 mm f/1.8 in the auto-focus mode with that camera and it uses the same SD/SDHC cards you already have.

Eventually as you get more cash flow and replace the D5000, the new replacement of the D300 should be available (sometime in 2012)

If you plan on doing weddings seriously, then I would definitely recommend getting a better camera.
A D7000 would be the best choice, if not going straight to full frame and buying a D700, but that is quite the investment. I would recommend getting the D7000 and using it as your main body. The high ISO sensitivity and great autofocus compared to a D5000 will help you greatly.

If you don't own some already, get some prime lenses with large apertures, which are fantastic for weddings. WIth a different lens on each body you'll have so many possibilities and you'll never miss a shot.

Happy shooting!

I agree with Ryan, the new sensor on the D7000 is streets ahead in low light noise and dynamic range than any sensor before it in the Nikon range, full frame results from an APS sized sensor.

I wonder if your money would be more efficiently spent on lenses and lights. Sure, a better body can hit 12, 800 ISO noise free~ with a 18-200 at 200 f/5.6 under overhead florescent lights.

Perhaps a flash, dome, and 2.8 lens would make it so you don't have to worry about what 12, 800 ISO will do. A 2.8 brings you right back down to 1600. I'm sure the D5000 can handle that just fine.