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Unless there's something really specific that the Nikon D5000 gives you that the Sony doesn't, then I don't think you will be any better off.
Compare Sony Alpha DSLR-A330 (black, with 18-55mm lens) to most popular products - CNET Reviews.
The Nikon will not magically fix the reflection and harsh shadows, and tripods are pretty much universal. The kit lenses are similar, the Nikon's perhaps slightly better but neither can be considered top of the line.
You will get more mileage out of learning to use what you have.