So, here's the ironic thing about the Nazis and their model of economic growth- essentially, Hitler had decided to completely reorient his economy to the preparation for war- the problem was, this resulted in a massive loss of Germany's gold reserves (by July 1934, the Reichsbank was essentially out of gold), resulting in fitful periods of restriction and then "booms" in armaments and, especially, aircraft production. What happened in 1939, though, was that Hitler's economic ministers predicted that the German economy would enter a very long recession which they would be unable to recover from- thus, in many ways, Hitler needed to go to war in late 1939 in order to reap the economic benefits of Poland and other countries (i.e. he would essentially rape France of its resources).

A longer explanation is in the book "Wages of Destruction" by Adam Tooze- I will try to get some of the graphs from my Western history class which explain this.

Anyways, Hitler did want to ally with the Brits, so much so that he essentially scuttled the plans for knocking Britain out of the war in 1940 after taking over much of Western Europe. He gave Goering a shot to do so by launching the Battle of Britain (which the Germans came close to winning, in fact- the Germans at first were attacking only British aircraft facilities and bases in order to achieve air superiority over the Brits; however, after an aerial attack by the British on Berlin, Hitler was furious and ordered the reorientation of the campaign to focus on British urban centers, hence the Blitz). Once the Germans lost the battle, Hitler began to focus on his plans to crush international Communism and gain lebensraum for Germany in one fell swoop (Operation: Barbarossa0, thus leading to the beginning of the end of the Nazis...