Can I suggest that you keep an eye out in the classified section here? There are knives for sale most of the time, and you can get a lot of knife for a hundred quid. To be perfectly frank you don't need to spend anything like as much as that to get a very useful tool, for example I've bought a very nice Helle here for a little over half what you're willing to spend. If you buy something new and then find you don't get on with it you'll take a bigger hit when you move it on than if you buy something 'pre-loved' as they say over in the States.
There are one or two sharks around but by and large you won't be ripped off here. You can always ask for advice with a link to the sales thread, although sometimes real bargains get snapped up pretty quickly so you might just be talking theoretically for a while.
That's not necessarily a bad thing. You've said you want something of an all-rounder but you haven't said what you generally do yourself so advice about specific examples is a bit difficult. It might be best not to swing too far from what you're used to. There are some pretty extreme designs around and you might fall in love with something at first sight but it might be a kind of culture shock if you go too far from the feel of what you already have. When I first picked up one of MartinK9's Woodlore collection I was staggered by the weight of it. Although for a number of decades I've generally used some sort of small folder most of the time, I have things like machetes and parangs which are much, much heavier. Even so the weight of some of the bushcraft style knives still seems out of proportion to me. The Helle that I have is very light compared to them and I almost don't notice it's in my hand. If I'm lugging around a small blade made from 6mm stock, to me it seems more like I'm carrying a lump hammer.
Anyway, try not to rush yourself into anything. There's a very wide range of choice, you have a perfectly serviceable bit of kit already, and you don't need to pressurize yourself into making a rash decision.
Oh, I forgot -- welcome to BCUK!