All three are super fab fun. Good for 3 or 4 players. For Settlers if you want to play more than 4, you need to buy a 5 and 6 player expansion. Carcassonne is recommended for 3 to 5 players. Give Me the Brain is probably good up to 8 (with the fatter, new set for sure).
If you're interested in any of these, send Jamie an eMail (swordinthestone at shaw dot ca), I'm sure he will be glad to fix you up.