Your usage and budget will really make this decision for you...
For us, after going through a new HP/Brother every year or two- we switched to Xerox's Phaser series (Laser only, no solid-ink... that stuff sucks and is terribly expensive). In addition, we use 3rd party inks that cost half of OEM with the same results... our 6180dn has become our workhorse, including calibrated proofing and prints the occasional shortrun business card/flyer.
edit- forgot to mention, the xerox laser that we currently have is 6 years old. runs like a champ, prints multiple times daily, no issues.