Wilwood are Ok but there are better available IMO , there are light weight are more race brakes & do not have dust seals ,
I have no specific recommendations but people have adapted Viper Calipers to the 11.7 " crossdrilled rotors & you have more brake pad options .
It depends on which Wilwoods you're talking about. I know their 6 piston calipers do have dust seals now, and I believe that some models of the 4 piston brakes do as well. The old 4 pistons definitely didn't, but I think they went away from that style now that everyone is using them on the street on their pro-touring cars. You can look at their specs online and see which ones have seals and which ones don't.
Dr. Diff has some great offerings. I just upgraded my Duster to his 13" kit in the front with Cobra calipers. It uses a redrilled Corvette C4 rotor and cobra calipers with an aluminum hub. So far its been a great set up, comes with everything you need. I really like the idea that I can get replacement parts at the local parts store if needed. That's the only issue I have with some of the aftermarket kits. If they discontinue that model kit, you could be out of luck later down the road if you need rotors, calipers, etc. The only part of the kit that is aftermarket is the hub itself, which should last a good long time. Realistically, the availability of the rotors, calipers, etc probably isn't a big deal for lower mileage cars, the brake pads on my Challenger went 40k miles and the rotors are still in spec, but its something to think about. The Challenger just has the later 11.75" rotors and stock calipers on it, and they work pretty darn well on the street.
I haven't done the rears yet, but again Dr. Diff has a 10.7" or 11.7" rear disk kit that allows you to keep the stock tapered bearings. Green bearings suck. Yes, that's just IMHO, but Cass's kit allows the tapered bearings so that's the only kit I'd use if I convert to rear disks later. Right now all my cars have 11x2.5" drums, they do a pretty good job for street use.