I have to agree with Jess here, nothing better than 2 boxers
But if your looking for another breed, I vote Mali's all the way.
Mali's short coat make them easy groomers (like Boxies). Mali's are smart, playful and love to work (like Boxies). Temprament make them some what shy around strangers but extremely playful with their owners. They can be somewhat possessive but not aggressive.
A friend's Mali is on the 3rd leg of her SNR training, she's an absolute gem. Mali's love to work they respond so well to command.
I've seen her rough it up with 5 other Boxies and yet curl up to a 4 year old and go to sleep.
IMO a well rounded companion.