Laser printer recommendations, please

I'd like to hear any suggestions, or recommendations for a robust and dependable laser printer. I often print mulitple copies of a 126 page PDF document using the duplex feature, so I do require a duplex printer. I now have a Brother 5150D and it's very unreliable. I'm running OS 10.4.
Thanks,
Doug

I've had my Canon IP4000 for 6mths and it is brilliant. Does duplex too, which is a requirement of mine also~

Thanks, but I really need a laser printer to keep the cost per sheet factor down.