Entirely depends on your definition of breaking the bank. 1060 should be around £200, that's probably not a bad shout. https://www.amazon.co.uk/EVGA-GeForce-GAMING-Support-06G-P4-6161-KR/dp/B01IOWT4DO
Cheaper would be better, budget a bit limited right now
RX 480/570 would be good and can be found for around 120. Gtx 1050ti is also a great wee card for 1080 res at around 90 quid second hand.
@gillies started
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Entirely depends on your definition of breaking the bank.
1060 should be around £200, that's probably not a bad shout.
https://www.amazon.co.uk/EVGA-GeForce-GAMING-Support-06G-P4-6161-KR/dp/B01IOWT4DO