Thanks for all of the nice replies!

We're driving up tomorrow morning to pick up Willie!!! I'm really, really excited. He sounds perfect for us. He's very easy-going and respectful of his adult foster-siblings, he's crate trained and housebroken already, and he's just sooo cute. There has got to be Corgi in him, he's much smaller than he looks (about the size/weight of an 8 week-old JRT puppy) and has the short legs. And, his coat is poofier than it looks.

I got a new crate and bed for him, and some of the food he's currently eating (Natural Balance). We'll probably spend at least $200 on toys and treats and stuff tomorrow, which will be fun. ^_^ I can't wait to cuddle with him and play with him, and show you guys pictures of course.

I've been totally researching it, but anyone have advice about how I should introduce Gonzo and his new little bro? I know it's best on neutral grounds, but should I also keep them apart and slowly integrate them together at home?