Having a budget is a good starting point, it lets you know what you can and cannot buy.

Depending on your needs (e.g., image quality, ability to shoot RAW, portability, high ISO, etc.) there are a ton of options out there. I've found over the years that your best camera is the one that you have with you, which in my case happens to my smart phone. Believe it or not, it is my "go to" camera because I always have it on me. At times, trying to find the motivation in order to lug around a DSLR and a bag full of lenses and equipment gets cumbersome and I've found myself shooting less and less.

For me, my next big purchase will be buying a very high-end point and shoot camera with a one inch sensor or larger that has the ability to shoot RAW, possibly RX100 Mark IV or the successor to the Panasonic LX100.

Even though it will not have the same image quality, autofocus (AF) speeds, ISO range, etc. compared to a DSLR, there are clear advantages being smaller and more portable.

For $900, you can stretch your budget to it's limits but before you pull the trigger on your new camera system. I would urge you to look into high end point and shoot cameras and bridge cameras as a potential option versus a DSLR. Even if you print your work on a large format printer (24x36" or larger), you will be hard pressed to notice the difference between RAW images of a: professional DSLR, consumer DSLR, bridge or point and shoot camera.

It's your money and the system that you will use, spend your money wisely.

Photozone.de is a great reference site for non-bias reviews of lenses on a wide range of camera bodies and mounts.