You'll probably get a load of differing opinions on this, although there is often a general concensus that paying say £50 for a high-end cable justing isn't worth it. From my perspective I have connected both cheap (£2) and expensive (£50) hdmi cables and can honestly say that I see / hear no particular difference.
When I set up my new system recently, I went for the middle ground and ordered hdmi cables from Amazon for around £10 just to be sure that I was getting the most out of what, for me, is an expensive set up. The cables that I have ordered from Amazon for around £10 look and feel to be very good quality and I've had excellent audio and picture quality. I guess that you might ask for a recommendation, but I'd rather you had a look at the reviews and make your own decision.
One thing that may be an issue is that if, like my 46GT30B, your hdmi connects reasonably close to the side of the tv back panel then some cables can be quite chunky and do not bend easily and can stick out slightly once installed - you'll see this aspect mentioned in some of the reviews on some hdmi cables.
Hope this helps and good luck!