I would say put all the 1800 dollar into SONM, hold your tokens for atleast a year and enjoy the profit. SONM is doing a great job, they are not at a conference in Barcelona to promote their company and show what they have done so far.
Thanks for your answer
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Where is better to buy it? In btc or eth?
There is not really a difference in the btc and eth price if you convert it to fiat. I recommend you to use binance.com for exchanging bitcoin to SONM. Hold this coin fir at least a year. It will give you alot of profit on the long run, don't daytrade this coin.