Please remember that any mention of competitors, hinting at competitors or offering to provide details of competitors will result in an account suspension. The full rules can be found under the 'Terms and Rules' link in the bottom right corner of your screen. Just don't mention competitors in any way, shape or form and you'll be OK.
If we're talking 400+selling old card then I'd go 4070, should give you a good boost without having to worry about changing psu etc if it's on the weaker side.
You can get an RX6800 for £430ish - look on HUKD.
