What brakes do you have? sliding or four pots?
Even with my four pot brakes, this time of year it is difficult to lock up the front wheels, as the grip from decent summer tires on warm dry roads is pretty good.
However braking should still be good, but does need a firm push on the peddal.
As stevew says a servo brace will help firm up the peddle and mean it needs less distance to travel for same braking effort, but it will not improve the actual braking force (it will just feel better, maybe giving greater confidence) or reduce braking distance.
Braided hoses will have little benefit, if your existing hoses are in good condition (in fact cheaper braided hoses are worse than standard hoses). Again the best they will achive is a firming up of the peddal, and less peddal movement. They will not make the brakes work any better, just give a better "feel"!
Changing the pads to "green stuff" and other high performance pads can help, but they only generely work better if at a higher temp, such as when driving on a track. If you are normally heavy on the brakes then they might give a benefit. Some of the high spec ones will actually be a lot worse than standard pads at cold temperatures!
Best thing you can do to give optimum braking is to regularily service the brakes, clean them, and ensure pads are not sticking. Check disks are not scoring or have any vibration. Use quality pads and disks from reputable manufacturers, and stay away from e-bay specials! Dont forget rear brakes at the same time.
If you really want to improve the braking, then you need to consider "big brake kits", particularily for the rear if you already have AP front brakes.
That and make sure you have some decent tires fitted