If you are interested in anonymous blockchains, I highly encourage you to look into Monero. It meets or exceeds that of ZCash. And Monero's RingCT is currently implemented and in use on TestNet with a target "go-live" this January.
8GB of RAM is only required when you want to transact; if you're not making transactions but are simply another node in the network (perhaps mining, or something), then I don't think the work required is any different from Bitcoin.
_"And Monero's RingCT is currently implemented and in use on TestNet with a target "go-live" this January."_
I couldnt find any relevant infromation on this. Does it mean that from January 2017 bitcoin will have anonymity properties of Monero?