There are mining profitability calculators available online. If I plug the numbers you've given into the calculator it gives an estimate of about 0.2 bitcoins per month mined at the current difficulty. 330 euros is roughly about the cost of 1 bitcoin at the current market price, so if difficulty stayed the same you would break even in about 5 months. Of course, the algorithm by design gets harder and harder to solve, which means hash rate goes up. You might never break even once you factor this into the calculation. For 330 euros I'd just buy a bitcoin, and put it into cold storage and wait for the value to go up.

I am thinking about buying a 485 Ghs/s Bitcoin mining rig for about 330 EUR, but im not sure if investing in mining gear is better than buying coins directly now. Oh and I do not have any elecricity costs at all.

What do you think is this a bad moment to start mining?