I've been using Textar and it's been good so far. Dirt cheap OEM brake pads You can try Hawk but in my opinion, it's pointless to spend too much on the pads when you're on stock brakes. That is only that much you can gain. If you want better braking performance, consider doing these:
1. Change the brake lines to stainless steel ones. I'm having Stoptech Stainless Steel brake lines on my car, makes a difference really.
2. Change the rotor to slotted/drilled.
3. BBK (if you don't mind spending a bomb).
You don't even need to go BMW service centre to change pads It's a straight forward job, any BMW specialist can do it. Don't waste your money there boss.
For brake pads better go to Ori or reputable OEM brand like TRW. Even thou its stock u need the braking power to stop 530. Pls take note 530 disc is not same wt 525.