Another one for the "Perks because they were rare, not because they dominate" list.
The Focke Wulf 187 Falke. For various reasons it never went into production (*cough*Hitler's a retard*cough*), the twin engine Zerstorer going to Messerschmitt (gee, what a surprise, eh?) for his bf110. However this plane in 1937 (first prototype) was faster than the 109B by 50-whopping mph! And that's in '37, folks! The 109 was thought fast, at that time! The V3 prototype took the final shape of tandem cockpit and 4x7mms and 2x20mms. The V6 reached 392mph on 2x DB600A engines, faster than any fighter in the world on Jan 1939.
It weighed twice the 109's weight but also had twice the range. Despite this superb performance, 3 were built, and were used in combat bt the Industrie-Schutzstaffel to defend the company works at Bremen. Somebody named Dipl-Ing Mehlhorn supposedly claimed several kills in one. In 1940-41 they were "loaned" to a unit in Norway, where they were much loved, but when the RLM heard about it they were furious (I mean, if they say the bf110 is the better plane, who are the front line pilots, that actually know the difference, to tell the RLM it's wrong??) and it was quickly recalled back to the factory.
It had a span of 50 feet, length of 36, and a height of 12 feet (all approx -- don't want to type in inches/fractions. The Max speed for the A-0 production version was 326mph, initial climb was 3500 fpm, and service ceiling was just under 33000 feet.
http://www.luftwaffepics.com/LCBW/FW187-A0-1s.jpgClick the link for an image of the factory's 3 aircraft on the flight line.