Seems the latest rage is one that started with a frat boy's frugality; two sawhorses, a piece of plywood and call it a desk! From "some assembly required" retailers to the most luxurious of the high end, to-the-trade suppliers, there is a sawhorse desk for every budget and design vision.
IKEA's done it again with the VIKA series desks. The top is height adjustable, can be slanted as well, and had for a song!

The sleek glass top and black, nickel finish steel legs makes the
West Elm version particularly suited to a modern aesthetic.
Bassett Furniture also gives their Guilford height and angle adjustability. What a great looking piece.

Love the look of the black leather case on brushed stainless steel legs from
Ethan Allen.

Technically, not a sawhorse desk, but with the same feel, is the Jean Prouve' designed table with sheet metal legs and oak top. Reproduced to exacting standards by Vitra and available through
Design Within Reach.

And then, the winner by a nose, the beauty of the Jean-Pierre Desk by
Helene Aumont with leather insets, handcrafted in walnut with traditional joinery, and also height adjustable. Truly a work of art, each desk is numbered and stamped.
With so many choices, the sawhorses and plywood should be set out to pasture, along with the cinderblock shelving units.