[Chief Roundup]

The only brand I would tell you to stay away from is Goodman. Their units are a lot more noisy all the way around. They put the cheapest parts they can purchase with no loyalty to an manufacturer of products to assemble an piece of HVAC equipment. You never get a compressor that is piped the same so if there is any problems it will cost more to have it worked on because it won't just swap out.
Those units are all good. There is no real difference between a Rheem and or a Ruud. I have installed and serviced both for years. I would also through Carrier and or Bryant in there they are good units with long history of quality products.
As far as sizing the equipment you will be purchasing.
At this point it has nothing to do with the size of your home, it is about the size of the existing duct work in your home. You can only move so much air through a piece of duct with out causing other issues.
If you look on the outdoor unit there should be a label that tells the specifications of the unit. There will be a model and a serial number on there. The model number will normally have the size of the unit as a part of the model number. Also generally it will be in the last 5 digits. Example: 38ETG030300 The 30 designates that this is a 2.5 ton outdoor condensing unit. A 3 ton would have had a 36 in there.
Now if you don't have any complaints about the unit you can go back and should go back with the same size. If you do have complaints you can possibly go 1/2 ton bigger if the duct will allow it or if you can add a register in a room easily off the plenum box or early in the main duct.