If you're in Europe, most of the bikes reviewed here are US models and probably won't be available to you. There is still plenty of good information here though, but if you can find a local dealer it would probably be best to visit them, or check out a European forum such as Pedelecs.co.uk for more relevant insight into your purchase options.
Ok I sort of take the above statement back...models from eg and easy motion among other brands listed should be available to you at close to your budget price, definitely take a look though the site reviews here. Anything listed around $1300 or under should be priced close to $1k euros.
Max 1000 euros. That is little bit hard to answer.
I guess best bet is follow some bikes on ALDI, ALDI SUD or LIDL assuming you are in germany.
below 1000 euro hard to get a decent e-bike especially in europe where 20% is already a VAT. So try to get something as cheap as possible (most probably all will be something bad quality and breakdown soon).
Second advise now check for some clearance available right now. this can be your best bet to get somethink better.
Molex also have some decent bikes you can check them too.