I also prefer processing drums outside a sampler, just 'cause it's more flexible. E.g., you can use some exciter or a bass harmonics generator plug-in on an individual drum channel, which would be impossible inside the sampler. Or you're able to make a completely free routing for your drum mics signal, whatever.
BTW, which samplers do you know, which provides an FX processing in the box? I recall Toontrack (EZ, SD), BFD, Addictive Drums and some Kontakt libraries.