You can't get 1TH/s for 1000 euros FYI. Need a few more hundred.
Probably in the $1500-$2000 range you can get a 1 TH/s miner for SHA-256.
You should be able to get a couple of Gridseed Blades(10 MH/s total) for 1000 euros though.
yes i know, i will raise the budget in case, if it will be worth. my problem is now which miner to get and what to mine.