Well think of it this way...
You have really good pads, they you will chew out your rotors..
or vise versa.
Changing brake fluid , you wont feel anything. If you want to eliminate the spongy feel get BRAIDED BRAKE LINES. They are about $140 from memory for the fronts.
Now, Im running Project Mu Spec B pads.. $150.
And got DBA 4000 series T3 Rotors. $165 each. so $330 for fronts.
Thats as cheap as it gets.
It also depends how you drive, if you want pads for normal driving to and from work . and your pads are low. They just get OEM pads or something slightly higher.
But if you like to drive hard like myself. driving through hills, having a good BITE!, stopping earlier. Then you need rotors and pads thats have a high heat temperature.
Now, again if you go too high in temperature it will take longer for it to warm up adn longer for it to brake good. Hence why they use it in racing cause they are doing 200+ km/h. So yeah really from here its up to you.
Changing rotors and pads is easy. I wouldnt cheap out and get new ones. YOU WILL LOVE IT!
Im not a hoon or what ever. But ive tested my brakes and everything on the car. Speeds around 160-180km/h. Touch the peddle the slightest, pwoh it just stops with ease! even normal driving, stopping at the lights. You stop earlier
BRAKES ARE IMPORTANT! You got the power, now stop that power hahah
Hope this helps man, if you need help just holla!