Hi all,

I have been mining for the pool for 5+ years with a gekkoscience 150mhz (16Gh/s) with no luck, however I've got some free electricity to use on mining.
Which miner would be the best for solo mining hashrate/price wise.
I have seen some cheap used antminers on ebay/marketplace, however I am not sure which would be the best.
Could you please give me some advice?
Thanks.