hi,
Lots of jewellers are having sales at the moment- I'd look out for those..also going north may save you a bit( it did for us but we went when sterling was quite cheap- it's climbing back all the time now).I saw ad on tv yesterday for jeweller in Belfast with big sale..
I think though you should be happy with what you're buying- whatever you're paying -because to be honest I can't see how you can up grade later ...I dont mean that in a bad way at all and maybe it depends on the person- you can always buy other rings -amazing, expensive etc...but still to me anyway my engagement ring is my engagement ring and I can't imagine ever changing it...that doesnt mean however, that you should go mad and buy the biggest, brightest etc...
If you want to talk figures...it depends on what your means...everyone thinks differently and times being what they are now perhaps if I said no more than €2000...some people will think that's crazy to spend on a ring while to others this is very little...to me even at height of boom this is the most I could bear to spend on a ring...