if its anything like the stilo, which uses the same sytem, 1ltr wont be enough.
just changing the fluid will improve the feel of the pedal no end, what brakes you getting?
braided hoses, will improve the feel, but a little extreme if your never doing tracks. make sure you get a full set, if you have a mikxture of original rubber lines and braided hoses, you will see no benefit what so ever, as they will just swell where the original rubber is and there is then a possibility of them bursting.
the stilo had two kits made, a 4 hose kit which changed the pipes at the front and then the ones at the back closest to the calliper.
the full set for the stilo was 6 lines which included the rear intermediate pipe too that went over the rear torsion beam, which the alfas dont have of course, so dont know whether there are 6 lines on the alfas, just mentioning incase as you dont want to do half arsed
also if you upgrade the fluid, make sure you change it more often like every 6 months at most as its more corrosive than normal fluid and left for a ling period of time will start to eat the lines and pipes