I've had an Brother 1450 at home for several years now (and we have 7 of them at work). They are very reliable, and will take card and envelopes. You can also buy an extra paper tray, so you can put A4 in one and A5 in the other (if you have that need). You can get cartridges for 4000 or 6000 pages.
Once you've owned and used a laser, you won't turn back! I use my old injet (also an Epson) for colour. Don't even bother looking at colour lasers, unless you win the lottery!
It's worthwhile searching around the net for write-ups and bargains...