well your goal is common. try to mine monero, zcash or dash. I believe these ones are so far profitable. you may resort to some new crypto, but you have to have a good knowledge and belief in it.
For now, these currencies are on my shortlist, I've seen them in similar scenario's. The thing however, is the power usage. NL is just really expensive. Would you recommend the mentioned GPU's for the coins you listed or would other GPU's be on your shopping list?