@medomain, the honest idea is you've got good combinations with wrong extensions and where the extension is relevant, the string of letters is ruined by an additional superflux letter(s) that would not cut it in the crypto world.
bitcoinforex.trade would probably make it even as the alternative 'bitcoinforex.com' would have been a no brainer. Altcoine - i'm not sure the additional 'e'' will do any good in English markets. The capital form of bitcoin only make it where the buyer isn't experienced otherwise any end user or crypto-investor who knows the ropes will find 'bitcoins' really odd as bitcoin is for both singular and plural like furniture. The hyphenated My-Bitcoin.org is not a true cut imo. May be BTGminers.com might fit the yardstick.