I also spoke to Argos, who confirmed that their lead time in 5-6 weeks at the moment. The colour options for their 2-pack finish is white, black, orange, two greens and a grey. Based on the above pics, white is still my favourite.
If you're having a fancy paintwork, perhaps two tone, fades etc. I can understand choosing a wet paint, but if you're just having it plain white, you may as well have it powder coated, it'll be a lot cheaper than Argos and a tougher finish as well. I believe Cotic frames are originally powder coated too.
Here's a picture of Rob's frame, (hope you don't mind Rob) powder coated at LSN, the same place I had my frame done. The solid colour shows the surface finish more than the pale metallic I chose:
Also, bear in mind, that white is probably the most forgiving colour, with regards to finish. Dark colours show every little surface blemish, but because reflections are essentially white, light colours can mask minor imperfections quite well.