700 GBP for which knives and in which sizes? It makes a difference. 700GBP is lot of money for two knives, but not much for twelve.
The alloy Global uses, Cromova 18, is relatively soft and has relatively lousy edge characteristics, compared to what's available in similarly and even lower priced knives. As professional knives, Globals have lost most of their luster outside of the UK and Oz. Given the other better and less expensive choices, why you guys still like them, beats the hell out of me.
As far as I know there's no guide for which steel alloy will perform a given task or set of given tasks better than others. Too many people give far too much weight the idea that some specific alloy will do a better job for them than a bunch of other similar alloys. Not that there won't be some slight differences, but any one of at least a dozen alloys would serve your purposes at least as well as any of the others.
There are already some decent attempts at listing the better and more popular knife alloys on the net. Take a look at Joe Talmadge's (slightly dated) FAQ
. It's posted in several places, but I've linked you to zkinves.com, which is a very good reference site for knife steels in general.
What you want are comfortable knives in whatever shapes and sizes are appropriate for your use, which are comfortable take a good edge, hold it for a long time, and are easy to maintain.
How and how well you sharpen is going to be a big part of choosing the right knives for you. So, how and how well do you sharpen?
PS. The whole Forschner thing has got to be confusing for someone who's paying in GBP. For the little it's worth, knives which used to be labeled Forschner in the US and Canada
are now labeled as Forschner by Victorinox
on the blister pack (or at least they were the last time I got one), and -- as always -- labeled Victorinox
on the blade. Yes indeed, R. H. Forschner was and is the North American importer of Victorinox knives, never a knife maker in its own right. Victorinox is Forschner's primary owner.