I got hooked on the idea of a mirrorless camera after reading about the A6000. I also think the Fuji XT10 would be a great option. The problem is that I have a very small budget. I've done real estate photography in the past (with company equipment) but right now I'm doing more graphic design so it is hard to justify a big purchase. It will mostly be a hobby camera right now but want to have the option to use it for real estate in the future. I found a great deal on a used Fuji X100 and I was wondering if any of the wide angle adaptors would be a viable option? I would love to hear your thoughts or any other recommendations you might have.
On the subject of lens converters, see this recent post. Stay completely away from wide angle converters!
Fuji mirrorless cameras are great but you need to get one with interchangeable lenses so you can get a wide enough lens for real estate. For that, you have to go with something like the X-Pro 1 with a XF-10-24 lens.
In real estate photography, THE most important piece of gear is your wide angle glass. The Sony A6000 has become extremely popular because you get a lot for the price and you have many options for which glass to use: