I have bought Octagon SF8008 4K single and I am very satisfied. It's value for money and it costs 110 euro close to the amount of money for a receiver you are looking for.
Do you had any other Enigma2 Box before, how you rate this Box ?
Yes i had a dreambox dm525. Dreamboxes are top but more expensive. This one is quick, no issues so far. It came with openATV preinstalled but i flashed it with latest openVix. Frequently they release new drivers update to improve performance and any issues they arise.