What catagory should i go for?

i would rate  the model type best for brush as follows from best to least

figures,ships,armor, planes ,sci-fi,and autos

Try the Tamiya 1/48 scale armor, just don't do an armor model that needs camo.

Smaller scale aircraft and armor kits as well as 35th scale figures are more conducive to brush painting. The larger the kit, the more likely an airbrush or rattle can would be preferred and needed for a proper finish. I have seen rattle cans used to make gorgeous cars in most of the standard scales.

Since I paint outside or in an unheated garage, I find I tend to move towards armor in the cold weather since I can paint it with a brush, plus even the light weathering I do on my armor can help hide any brush strokes I leave. Some aircraft can be done this way as well depending on the type and size. 1/72 WW1 aircraft is not a problem for me.

Autos and most aircraft I prefer to have spray paint as options. I'm just breaking out my airbrush to give it another try.

Depending on how good you are with a brush, anything is a possibility. I've brush painted cars that came out fine, its just more work and I find not quite the same level of quality as even a decent rattle can paint job. Brush painting a large surface is definately a skill that needs to be developed, not just grab a brush and go. Using flat paints is a big help too, you can always put a gloss coat over it later.

Anyway I'd vote armor as the most brush friendly, just stay away from the later war German camo schemes, a nice OD or Panzer Grey would be a good start.

I've seen some pretty good work with brushes on 1:48 A/C, but 1:12 Auto is to big. You say you have no room for an airbrush, but what about a rattle can? It doesn't take up much space, and just needs good ventilation and/or a respirator.

Well, the only area where almost everyone uses brushes are figures. A 1/12 car is huge in the modelling world and unless you are super skilled with brushes and can lay down a smooth, glossy finish, you may be very disappointed.