Thanks for the reply, I can get the system for $400. I was was just thinking that it would do good with monero and the Random x algorithm. Do you have any ideas that would give me a better bang for my buck?
I don't know for any alternative for $400 seems the mining profitability is super low but since you have free electricity you can mine any potential coins that you think will grow in the future.
According to the reddit link that I posted above you can get 1716h/s with HP DL980 G7 which you can make 0.5+ cents daily if you mining Monero I don't know to other based CPU coins. So if you can earn 0.5+ you can reach the ROI 2 to 3 years.
The only thing that I can suggest to you is to believe in the coin you mine and hold it for a long time and maybe the value might increase to x5 or more so you can reach the ROI with higher profit.