My choice would be another Stakenet (XSN) masternode. It would enable me to establish another source of passive income and would also work as a long term hold, since their team is heavily developing the coin and bringing brand new tech to crypto, that hasnt been there yet. such as:

- cold staking from offline wallets via tpos
- ledger and xeeda hardware wallet support confirmed
----> holding coins safely in my ledger and still receiving stakeing rewards
- staking platform www.stakenet.io for solid POS coins. atm XSN, STRAT and PIVX are confirmed. QTUM and DCR to follow soon
- the first truely decentralized dex hosted on the masternode network of 1700+ mastermodes.
-----> as a masternode owner i will get fees from people using the dex
---------> higher passive income
- lightening standard based swaps
- ccpos will let me decide in which currency i want to receive my staking rewards
----> step 1: receive masternode rewards
----> step 2: stake masternode rewards from ledger
----> step 3: choose currency in which the staking rewards will automatically be payed
----> step 4: ?
----> step 5: profit