Thought I might add a couple of comments, I have a cast 16kg bell that I got from a Powerhouse Gym Shop. It has served me well, good clearance etc. The only issue I had was the flat sides causing bruising. I sorted that by adding a blob of bue-tac and creating a "round". Good value, good for beginners but I wouldn't drop it 6" never mind 3ft.
I wanted to get a 24 last summer but caved at the prices and thought I'd try the Kettlestack as it was better value. This is a good bit of kit (mine is the newer one with larger handle) but I think the weights we get in the UK are not really suitable - I've yet to see any disks like those on the Kettlestack site for sale in the UK (slim ones) except on premade DBs and Barbells in commersial gyms. The stack is ideal for heavy swings and can be used for snatches (bluetac again

) but the problem I have is with slow moves , it's impossible to get a good comfy rack position and I've gave myself a couple of cracking forearm bruises as the stack has moved slightly on the arm and caused a pressure "nip". The fact that the handle is weighless means the heavier you go , the more your shoulder stabilisers and grip are stressed. Again, good value, versatile but of late I've loaded it up with 12kg of rubber plates (from Tesco) and use it for warm ups only.
Wolversons.... my training led me to talking my brother into getting his own and he finally went with the Wolverson Comp's. I really like these - brilliant for snatching and grinds - not so for 2 handed swings as the grip is quite narrow - but the advantage there is that when you'r edoing a Time / Max rep set and you start getting sloppy, the narrow grip helps prevent disasters. So I asked my better half for some new bells for my 40th. I was going to just get the 20 and 24, but it actually worked out nearly as cheap to get the 16,20,24 set. £120 delivered

These are coloured and slightly different to my bro's Comp. They do appear slightly less well finished and as a set are not totally uniform in grip thickness/smoothness etc. Still great value though and if anything the "clearance is a little more than with the black comp models.
I'd love to be able to afford some London KBs or Stan', beauties, (and will no doubt advance later) but I can heartily recommend Wolverson's - great kit, great price and great service - they actually phoned my wife back, minimising any phone cost to us
All the best
mj