Which monster do you like the most in Heroes 5 at level 5?

Yes, I really like the abilities of the Nightmares, and they have increased stats and decent power. Overall, they are great! It's just that I rarely get to play with them because I don't have enough money... I need to buy Devils, and Pit Lords are a must, and you can't do without Demons, and you also need to buy Dogs and Imps... so they usually end up sitting on the bench.