I'd like to find one of those buffet servers that keeps the food warm.

I found a bakers and chefs triple burner Server & Warmer. This elegant appliance keeps food warm and ready to serve and is suitable for breakfast, brunch, dinner and hors d'oeurves. This burner comes with Clear high domed slotted covers with convenient utensil slots, Stainless steel frame securely holds pans in place and Converts to warming tray without pans: 20.5" x 14" warming surface. This is great entertaining! I also found a Elite Platinum Triple Buffet Server & Warming Tray. It has 3 removable buffet trays, and Cool-touch handles. These also make great gifts!

Wow, how about a Waring product, can't go wrong with that. I found a stainless steel buffet server has three 2.5-quart stainless chafing dishes that each hold 24-oz. The stainless steel base doubles as a warming tray. This server also has an adjustable 155 to 200 degree F thermostat and stainless and poly lids. $99.00 Or how about this This Wolfgang Puck five piece buffet burner serves as both an extra cook top, or as an elegant buffet warmer when entertaining guests. This appliance has two cast iron burners rated at 750 watts each. They can be operated independently, or both at the same time, giving you a total of 1500 watts of power. Included with this double burner are two 8" stainless steel cookware pieces. The cookware has tri-ply impact bonded bottoms that ensure even heat distribution, riveted handles for strength and tempered glass lids which allow you to monitor the cooking process. The cookware is oven safe up to 400°F and is dishwasher safe. A steal at $69.99.

You really can't beat the price on this BroilKing Professional 4-Pan Buffet Server with Clear Lids from QVC for $184.16. If you have a big party serve it up perfectly with this professional-style buffet server. Four generously sized pans let you load up on hearty fare while clear lids keep the food warm and in easy view. From BroilKing. Picture not showing so sending link.