Some of you might remember my guinea pig Wilbur...I got him a few months ago with an abcessed eye. He is almost all grown up now, and doing great

He likes scritches in his cage but he hates to be out of it, and his cage is pretty large (40x36x24) so he spends most of his time in there. I figure he must be bored and lonely and I have read that they should be kept with other piggies, so he is getting a friend.
We are meeting a lady from a guinea pig rescue with 3 male brothers his age (they have BLUE eyes!

) and hopefully bring home a new friend this weekend. The piggies have been seen by the exotics vet at work so I know we wont be sharing any germs
Anyway just wondering from you guinea pig people if you have any tips or advice on what I should expect? I have never had a guinea pig and really wasnt even planning on getting this one, so this is a shot in the dark...