I have no idea what will suit your eyes but from someone who has experienced the illness that is glass addiction, I can tell you that you should avoid the erros that loads of us have made.
It often takes time to fully appreciate how important weight, dimensions and proportion are. What rifle you are mounting to, what method of mounting you will use and how that results in rifle fit. These are very very very important. With the sort of money you are quoting, you will not buy bad glass but you absolutely do not want to make a mistake spending that much money. It would be easy to spend £3k on a PMII with huge zoom, large dimensions and great weight and while it is an awesome scope, it will not make shooting deer any easier. It will make it harder when you consider walking with kit and settling down behind a rifle where you really want your eye to natually fall on the ocular, rather than feeling you are craning your neck upwards to accommodate the huge objective lens you chose because everyone is saying how much better that will be.
50mm is plenty. If you were not shooting in woodland, I would even say 42mm would be good but 50mm would probably be a good sweet spot.
Zoom range will allow you to zero the rifle easily and make slightly longer shots more comfortably but anything above x16 (and even x 10) is mostly redundant for almost all deer hunting.
Try and look through some scopes to appreciate what view suits you best, as different makers do produce different pictures despite them all making top end glass. I personally dislike Zeiss but they are very very bright. Others dislike the calmer and more placid dimmed view of a Leica but I really like it. There is no right or wrong answer.
Once you have decided what glass you like, then pay attention to the above in terms of weight, size etc and how it will marry up nicely to your gun and anthroprometically to yourself. We are all built different. When you have kit that falls in to your shoulder and eye nicely, the body feels far less tension and you will make better shots from a variety of positions, more of the time. Which is a good thing.