I got my TJ07 for £120 second hand and was so impressed with the shear beauty and quality of the case! Powdercoating should be about £80 (externals cost me £40 in glossy red) so I don't see the problem. Just gotta keep your eye out on the MM. For air cooling, you could add a front bay adapter for a 120mm fan or do what I'm doing in my mod project. It's a fantastic case, the highest quality, the best looks (while still looking refined), the best window I have ever seen. You also get the bonus of a removable motherboard tray and a rivetless construction which makes your life so much easier if you need to get it sprayed. The case only uses 2 or 3 different types and they include some bags of extras, dead easy.
Although I don't have experience in it, the ATCS840 sounds ideal for your aircooling needs and has a quality finish to it.