I have to admit I use Cube4You more than Lightake, even though Lightake is cheaper, mainly due to my impatience and abilty to go for express delivery, which is as fast as shipping within your own coutry (3 days).
They do Dayan cubes, both Guhong and Lingyun and I always opt for DIY. Another advantage with using them is the stickers they stock are Cubesmith, just with their own logo which are great quality and especailly noticable on black cubes as the Cubesmith one have a much lower tranlucency giving the colour more definition. Please be aware you have to order the stickers as well as your DIY as its only the stickers sold on their own which are Cubesmith.
However it has to be said Lightake have a great range and price and are definately worth ordering from if you are in no great hurry for your new purchses.