^^ good advice there.
One thing you'll discover really quickly is that SONAR's AS detection is... interesting. Sometimes the late or early transients can work out fine for what you're trying to do, but a lot of times it's either sloppy or just so much random stuff added in, you spend just as long moving transients around. I've discussed a bit about how to deal with that in THIS thread:
http://forum.cakewalk.com/FindPost/3388204 And I'm sure you'd be able to apply that gating technique to percussion too if you're careful with your gate settings.
As far as choosing takes goes, I tend to set up track templates that include folders for when I record. EG: I'll set up all of my drum inputs (kick, snare, hats, etc.) inside a Drum Rec folder. I set that to be pre-armed to record, and then right-click on any one of the tracks and choose Save As Track Template.
When it comes time for another take, I archive the first folder and close it, then I right-click in a blank area of the track pane and Import Track Template, choosing Drum Rec. That gets me everything set up, all armed and ready within a few seconds. Repeat as necessary. Easy!
Choosing the takes is a case of having a fairly decent speed drive for your audio for a start.
Set up your "master" folder where you'll be copying stuff into, making sure the track order matches your Drum Rec folder so you'll be able to drag stuff directly into it without having to shuffle anything around. Make sure you've unarchived each other take folder you've done, but have them muted. This will belt your disk since it's now muted instead of archived, taking the strain off, but it'll be faster to comp this way.
I'd go through each take, having a listen, maybe dropping markers as reminders of parts you like. When you have what you like, it's easy to left-drag select over each section and SHIFT+drag everything you selected all at once up to your master folder tracks. Eventually you'll have a full take in that master folder, and you'd go back and adjust slip edit times, etc.
If you were planning to quantize drums, do each section first with a bit of overlap. That way, when you put it all together, you'll be able to move the boundaries back to where you want, but you'll know just past your edit point will also be in time, so it'll be a simple edit.
This is all sort of annoying the first couple of times but you soon get VERY fast with it. I've done literally hundreds of songs this way and the sessions fly by.