Herein lies your problem: DSLR bodies have nothing to do with the quality of macro images. It's all in the lens and to get the best macro quality, you need a macro lens. Which is expensive-easily as much as the camera body or more.
There are a few options for macro starting out without investing in a macro lens: extension tubes decrease the focus distance between a lens and it's subject allowing you to get much closer and to shoot a much larger shot of a subject.
You also need a tripod for true macro work. A good tripod isn't cheap either, but a cheap tripod will definitely get you started. It's not the greatest, but you can still get great results with it for now.
Have you looked at cameras yet and has anything caught your eye? We can tell you that we love our camera-or hate it in my case with one of mine. That really doesn't matter if it doesn't fit YOU and what feels right for you. Many of us like a larger, heavier camera. Whereas many beginners do not. Many women don't want the larger heavier cameras.
Nikon lovers love the way and features of Nikon cameras. Canon users could use a Nikon camera, but it wouldn't feel right in their hands. Same with the other brands.
About all I can tell you without any more input from you is tell you that I'd look first and foremost to Nikon and Canon then Sony and Pentax. In that order. Look at the features of each one and decide what features you really think you NEED and can't live without. Then go to a store that carries cameras and play with one of each. One should feel pretty right to you.