Where to buy bits?

[Waaaghpower]

So, I am considering as opposed to adding to my 3000 point ork army (besides apocalypse, that stuff is fun as heck to build) I could just go through my entire army, model by model (about 200  of them) and make them all look totally bad-as... Wait, there might be kids on here. Totally awesome. Anyways...
I was wondering if there was somewhere I could buy bits and parts to add on and customize.

[Sorck]

In the UK we have a few bits suppliers I know of.

http://www.letthedicedecide.co.uk/ - I've used these before. Arrived in good time. They do ROW deliveries.
http://www.bitsandkits.co.uk/ - I've not used them but they look to be reasonable
http://www.bitzbox.co.uk/ - Again, I've not used these but they definitely do ROW shipping and I've seen them recommended before.