Go and try them! It's really important to actually hold a knife before you buy it, especially with the premium end knives such as Henckels, Wusthof, Global or Gustav Emil Ern. You will be amazed at the difference in weight and 'feel'. Everyone's hands are different and, just as certain brands of shoe fit differently to each person's feet, certain knives will feel far more comfortable than others. I've been a chef for 16 years and I can't stress enough how important this is; I celebrated getting my first job in a Michelin kitchen when I was 18 by treating myself to a 10 piece set of Globals, but as good as those knives were they just didn't suit my hands and gave me pressure lesions. I now use Wusthof and G.E. Ern. Also, Global knives are very well made and very sharp, but nowhere near as robust as the German brands. I have always found Globals to pick up nicks and dents quite easily. Nisbets had a sale on Dick knives recently, which are also extremely good quality, so you may be able to pick up a bargain on their website. But like I say, I'd go to your local kitchen store and try a few out first.
Don