Top Printer for Small Business

Hello All,

I am looking for recommendations on what printer to purchase for my small business. I have the following requirements:

1. At least 25,000 duty cycle
2. Must have 10/100 network access
3. Black/White Laser
4. Heavy duty/Durable
5. Capable of handling single print jobs of up to 500 copies without overheating

Any recommendations would be much appreciated, thanks!