Audi A3 purchase

Hello, after reading a lot about cheap car intermediaries here, I wanted to ask if someone had already had difficulties with the company APL. I would like to buy an A3 Sportback Ambition TDI in February 2008 and have put together my desired vehicle via the configurator on the Audi side. Come with everything I like so much to just under 37,000 €. Now I have heard by chance from the company APL, where I could get the car around 500€ cheaper . Maybe someone from the Berlin area has a tip, whether I can get a strong discount at an Audi dealer in Berlin or Brandenburg? How much can you beat out at all? With the sum you always have some concern to buy via an intermediary. But APL does not want a down payment or any other payment, does it? Since I would want to pick up my vehicle at the factory, I don’t need to worry about a re-import, I guess. Is it worth it because of a facelift to wait for the car purchase? The revised models will certainly also be more expensive. And so much will certainly not change, I guess. I can also do without LED rear lights. When do I see them?? Or do they also make the front section? Oh yes, someone knows if the stationary heating offered by Audi also preheats the cooling water? Especially with a diesel and a short distance to work this would certainly not be unfavorable. Otherwise, the diesel is yes from the verb even if it costs more in maintenance. I buy a new car for the first time. So far I have only bought annual or used cars. Therefore, please excuse the many questions. Greetings