Depends on the picture! I contend that for many shots you don't need autofocus at all. For kids, action sports or wildlife, sure fast AF, high fps rate, high IO performance, etc. is great! But for landscapes on a tripod? Sunsets? 5x macro? Adult portraits? I don't think so. If you're buying new today then by all means get a new body to start out current but otherwise stick with what you have.
Great glass can really make pictures pop, let you stop action or get narrow depth of field but the subject really matters most. You need to choose the subject, the framing, perspective, depth of field, etc. The body can help you with the exposure, IS can help you hold it steady but it can't help you with composition yet, unless you count the grid lines in live view LOL.
Unless the OP needs to do wildlife photography I'd say the lens set and body are great. For birds I'd get a longer telephoto.
Off camera lighting can open up all kinds of possibilities. The crummiest lens in the world is usually pretty good stopped down to f/8 or f/11 and a flash can get you there. You don't need to worry about noise reduction so much, you can really control the light and shadow. Colours are more saturated, sometimes too much. You can go portable or with stands and umbrellas. Controlled lighting is a whole new learning curve however.