Use that ETH to buy some bzrx and wait for the right moment to sell it. It has very high potential with fulcrum (uniswap type trading and liquidity platform) and torque (lending platform) protocols on the table (already launched).
Don't worry about this, NEO has not spiked more than 2.5x and is 1/10th of its all time high. I think it has an opportunity to rise, but bzrx is still better.