I am debating making a change in my gear. There is always that debate between full frame and cropped sensors and the people who say you can never be a professional with a cropped sensor, but that is untrue. Some working "professional" photographers like the cropped sensor. For example I like if I am going to shoot wildlife I can take my 300mm zoom lens which essentially becomes a 450mm zoom for a fraction of the price, not to mention the weight it saves me in my bag. Carry a bag of gear around long enough and you will see why people have assistants. Most professional photographers I have spoken to state it is not the camera but the person, sure you need gear that can work with you but it is not the most important, and lenses are always more important to me than the camera body.
For me the debate is not focusing on full or cropped. I am torn between two different cameras. One is better in low light, but the focusing system is not as fast and the other has a better focusing system. These are two elements that are essential for me shooting concerts. At this point I am leaning toward the one with the better faster focusing system. The low light differences are marginal to me and I think this can be compensated fairly well with quality glass. I get torn because a lot of people really love the other camera, but in situations like concerts where there is a lot of movement fast focusing is important.
Who knows I will continue to decided this. To me gear is about what works best for you and your needs. When I first started shooting I went to my local camera store knowing nothing. The clerk discussed Nikon and Canon with me and for what I was looking at they were both fairly similar. He gave me two pieces of advice to decide. 1. If I knew other photographers that I was close with consider going with the same brand as them because we could share gear and 2. go with what felt better in my hands. Being a lefty and cameras are designed for right handed use this resonated with me. I grabbed the two camera as you would shoot and I knew instantly which one felt right. That was the easiest decision and it really made it clear.
Let me add a side pitch here. If you have a local small business camera store support them. They have been so helpful to me on this journey. Sure you can get a better price many times off the internet, but nothing beats the experience these stores have. You can't get this experience at a big box retailer consistently. Plus the prices often are not very different. Recently I purchased my 50mm 1.4 lens at my local store. I love that lens it is amazingly sharp, fast and the quality is superior. After the instant rebate the price was the same as what I would pay online so don't rule out these small businesses as being too expensive.
I wish all gear was as easy to decide on as my initial camera. I have gone through multiple camera bags, because they just don't function the way I thought they would. Opinions and reviews from others are helpful but just don't get bogged down in these. One review feels one way and another goes the completely opposite. Full frame or cropped seems to go along the same lines as the Nikon or Canon debate and as for you can't be a professional photographer with a cropped sensor I don't buy it. Do you ask a photographer which they use when you are hiring them or purchasing a print? Most likely not. You care about the final result and how that image makes you feel and that is the way it should be.
Make your decisions based on what is right for you.