I don't think that big brakes are the answer for you, I have loads of people telling me that they NEED big brakes and if they went for big brakes it would have just been a waste of money! SO!!
1, Big brakes are not always the answer, a lot of cars out there can be WAY over braked BUT mainly this depends on your driving style.
In town, pottering here and there with a little brakings - stock stuff with MAYBE performance pads - Brake fluid every 2 years just normal DOT 4
Fast road as I have always put myself - Performance brake pads with stock discs and MAYBE grooved discs (never go drilled as the harder braker you are the more likely they will crack at the drilled holes) - Brake fluid, performance high boiling point every 1 year!!
If you find with the above and you are getting BRAKE FADE then this is the time to upgrade the kit as the bigger the disc the better the heat displacement! BUT a 2 piece brake disc design will always dispurse heat better than a 1 piece so check if they are available.
Track - pretty much a big brake kit every time as you will be hitting the brakes hard very ofen in a short time making great heat levels so the bigger the DISC pretty much the better and again performance fluid, changed every 2-3 track days but this can depend a little on own pref.
SPONGEY PEDAL! - Check brake fluid and brake lines!
NOTE the ONLY thing that a braided brake lines offer is a less spongey pedal and a better brake response! (less flex in the system so when you press the pedal the pad moves and NOT the lines)
Anyway back to you! :P
I would say....
Performance brake fluid (NOT Dot 5.1)
New stock discs (good qual like pagid, brembo etc)
A good set of brake pads none of this EBC crap (Ferodo DS2500, Tarox Strada etc)
BUT check the condition of your brake lines if it is a very spongey feel you are getting they might be worth an upgrade.
To give you an idea with my 328 I drive pretty hard and was doing 3-5 trips a week on a approx 15min windey road (Snake Pass) with the odd track day.
I think ONCE i got brake fade and that was with new pagid discs, Ferodo DS2500 pads, braided lines and even just fresh normal DOT 4 fluid which I had at the time. When it comes to track and Snake I really 'go for it' so this set up was not 'tootled' about put it that way. I didn't see the need to upgrade them further from this.
The only reason I am going for the Tarox is because I am getting them at a... well EXTREMEMLY good price and a Supra 3.0TT engine is going in.
Anyway.... I shall stop going on and on but I hope all the above helps, I am getting tired and cannot be bothered to proof read it so fingers crossed!! HAHA!!