The last great HP Laserjet was the Laserjet 4 plus. I hear the 5 isn't too bad - but the 4 plus is a work horse group printer, totally serviceable(side panels just pop off and you can replace anything), and under $250 on ebay.
I print about 5 pages a day, and at this rate my toner will last 10 year or more? It's crazy.
They are a energy hog, even in "power save mode" - so if you turn it on and print, and turn it off, it's all good.
I use it to print instruction sheets in bulk (usually 100 at a time) and picked it cause of the low cost per page, and having one in my office while working for AMEX, back in the mid 90's I knew it was indestructible. It's also awesome at small sheets in the drop down paper tray. It can print on something like a check without it getting bound up.