Too many options to list and all would involve Big $$$. Monster Brake Kits etc.
If you just wanted replacement pads I recommend Lucas TRW as the best replacement pads. I will get you part numbers later.
If you want to spend the money, you could look for a 4 or 6 piston front calipers with larger rotors (although they are 312mm off memory).
There are many pros and cons for slotted / cross drilled brakes. Depends if you are after looks or performance.
You may also be limited in caliper size due to the 17" wheels, food for thought!
Keep us up to date!!!
Glenn