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As stated above you can get an XTX for around £840, so I'd say that or a 4080 Super if you can stretch to £960, otherwise above that for the latter costs more than the extra features warrant IMO.
However, as a 6800 XT user myself I'd wait at this stage in the release cycles unless you really need the performance for a particular game and don't want to compromise with lower settings.
However, as a 6800 XT user myself I'd wait at this stage in the release cycles unless you really need the performance for a particular game and don't want to compromise with lower settings.