Carpentry and Woodworking - caulking for stained fir casing and baseboards?

I'm in the process of cutting, staining, and polyurethane....ing (?) 3/4" x 3 1/2 douglas fir (3/4" x 2 1/2 for casing) for baseboards in my house, up against drywall. Yes there are gaps between the casing and drywall, and baseboards and drywall in a few spots, and I"m doing my best to minimize these spaces, but is there some kind of caulking that might be suitable for closing up and leaving this set up in the most appealing state? I've already painted the walls, so am hoping to not have to get into more painting. What about a sanded type of caulking with a natural tone - ie beige, etc.?

thanks.

Marksr will chime in shortly, but when I do stained trim against a painted wall, I use a compatible caulk to the wall color, usually white. I like Alex PLus, but other brands are comparable. Apply the caulk to the crack with as small a tip cut on the tube as you can. Then chase it with a damp piece of sponge. I like tight sponges. Keep the sponge rinsed well. You will wipe all the excess off both the wall and the molding, leaving only what is needed to cover the crack. I wouldn't even bother touching up unless there is a vast disparagy in the color of the caulk and wall.

It's best to not use caulking. You could use a clear latex caulk [after the 1st coat of poly] but it might be hard to cut a clean line the next time you repaint. What I usually end up doing is, after the woodwork is finished, use regular white latex caulking on the gap and then carefully cut in the wall color to cover it.