Well, I was going to suggest discrete drums, but...
Have you checked out the Joey Kramer CD? ( of Aerosmith fame) I\'ve never heard it, but it might be worth looking into.
Another option that a lot of guys swear by is \"Drum Kit From Hell\". From what I understand, it\'s single hits, not loops, but there are supposedly MIDI files that come with it programmed by drummers using the sounds themselves. It also might be worth checking out.
There are also a handful of great loops for rock on the Spectrosonics Backbeat CD.
Joey Kramer\'s set is the most like Discrete drums I\'ve found. It\'s pretty cool and I use it often. Actually, I tend to pull all my one-shots and most of my loops from either Joey Kramer or Discrete Drums. Do you have both collections of Discrete Drums? I actually like the newer stuff better then the older stuff. Chris McHugh is a killer drummer and I just keep finding new ways to use those grooves. They have hands down got the most use of any acoustic drum loops I\'ve got!
Another option is to check Steve Smith\'s stuff. It\'s pretty cool but not on the level of DD or JK.
Have you checked Scarbee\'s new drum library? imperial Drums? Pretty slammin and I think they have loops. I also think the new Drumkit from hell will have several loops with it. I have the original version and it\'s very cool for what it is, but it\'s not all that some people have cracked it up to be. And as far as the loops are concerned - they\'re just .mid files that play the samples. They aren\'t true \"loops\" recorded as such.
One place you CAN NOT go wrong is with Spectrasonics stuff. Backbeat would probably fit your bill pretty well.
I have GigaDrums as well. The cymbals - the hats especially - sound very nice. I haven\'t gotten excited about the kit they recorded though. I will say the release-trigger function is great for rolls and flams though. I am going to start experimenting with it more here shortly. I like the way that it is recorded with different mic positions that can be mixed together.