I have a Leupold MK 4 tactical 4-14x, 30mm tube, 50mm objective, illuminated with target turrets and it will do all you need. Should be able to get one for £1k.
Leuplod do have some neg feed back on this site but mine is excllent, bomb proof, compact and huge range od f readily available monts and accessories. It is faultless and more than adequate for everything you are likely to do. Has sat on my .223 for years.
That aside the eye position is critical but ensures your head is in the correct position. Bit of a bugger if you are in an awkward position lamping at night.
In the day cannot fault it and have had shots at crows ridiculously long ranges, target acquistion was fine.
However have used a Nightforce NX and I would concur better scope, but then it is 56mm.
I do find however the reticule is just too fine for me, I can barely ses the 600 yd dot.
IOR are ment to be very good, but are very bulky CF Leupold/Nightforce.
I think it would be worth looking at the Meopta range, which have excellent optics. Alternatively if buying new, the new Zeiss range look remarkable value and optics are superb.
D