SW20 Brakes question and help

Hey everyone

So before i go on the club run on the 18th, i possibly want to get the brakes done first
the issue is that the front discs are warped as it makes a klunking noise while on the brakes . Along with this the front calipers 'stick' sometimes, which makes the car pull left or right ever so slightly. 

My question is: can brake shops machine slotted rotors? and would it be better to have the calipers rebuilt or to buy reco'd calipers?
 
also i'm not sure if my rotors are factory. its a 1990 g-limited. here is a picture for reference where you can also see the marks on the rotor from i dont know what :S


thanks 

Stock front rotors (258 mm diam) are 25mm and can be machined down to 24 mm.
Stock rears (262 mm diam) are 16 mm can be machined to 15 mm
As already mentioned they look beat up. Anyway make sure there are no radial cracks, otherwise replace.
 
Caliper rebuild kits are fairly cheap and easy to fit.
 
After recoing brakes, make sure you bed them in properly.

nice coilovers.