A graphics card capable of 4K gaming alone would cost more than your entire budget.
You dont need a £160 graphics card to play 4k videos. A £50 would play 4k videos.
all recent Intel Core i5/i7 and AMD APU will output 4K video comfortably.
Only @ 30hz
which is what you need for a HTPC
You're just being pedantic there. The OP has made no noises to that effect and neither could be classed as normal activity for a "HTPC".Depends if you want to stream 4k 3D content or not... Or 4k games.