As far as magnification goes, your scope has plenty and unless your eye is failing you in some way(let's pray it's not) or the scope is defective, anything at 350 yards with your scope cranked to 10 should be quite visible. 10X is used to 1,000 more than you think. We all have our limitations and to my eye, I start wanting more than a 10X when I reach 600 yards or so. Am I still able to precisely hit what I'm aiming at? Yes, but I don't feel comfortable so I'm thinking about going to 16 or 20 soon myself.
As for what brand, you'll get bombarded with answers. If price is no object, your choices become much slimmer. If you want very good quality but don't want to spend a grand or more, your choices just opened up a quite a bit.
Personally I don't want or need a Nightforce that costs more than my rifles, but that doesn't mean I mount garbage on them either. I have a couple Super Snipers which are comparable to scopes that cost 2 or 3 times as much which leaves me more funds for other accessories. With that said, I've recently mounted a scope I like even more than the Supers and it's 100.00 less so I'm not complaining! (the Bushnell elite 3200 10X w/mil). To me the glass looks clearer, other than that they are tied in performance(I can live without the 30mm tube). I am interested in the Bushy 6500s though, that 2.5-16x sounds sexy and once they are available, I may be using that Stimulus check
With the hunting and shooting I do, I don't need that extra % of light transmission at sunset, I don't need to reach out and touch an elk(although I'd like 2 someday) at 900 yards. I just require that my scopes track well, have good glass, and can take abuse.