Please post a link to the actual public rack (the url) and NOT a jpg... help us help you!!!
If you are happy giving your money to the b-company, then go ahead...
the biggest problem with buying something like the neutron is that you don't get to choose exactly what you want and if you want to swap say the filter for something else, then you can't just pull the filter and replace it as easily
as for Maths - I would go for it now - I didn't buy Maths to start with and it took me about 6-7 months to get round to buying it, but I wish I'd bought it in the first group of modules I bought - and worked my way through the 'maths illustrated supplement' a good few times - as it's the best learning resource for patching, especially thinking about patching, there is
"some of the best base-level info to remember can be found in Jim's sigfile" @Lugia
Utility modules are the dull polish that makes the shiny modules actually shine!!!
sound sources < sound modifiers < modulation sources < utilities