My GOD!! Its so blinkin small.....!
I went for the MiniPac complete with the wiring harness pre-built which is supposed to be perfect for the first time builder - We shall see!

So far, to be perfectly honest it does look a little bit daunting.. so when I connect it all up I will create a very detailed step by step guide.  Probably downloadable as a PDF file.
I am sure that other first time builders would appreciate that.
My coin mech's are still staring at me waiting for me to lavish them with attention.  I think I should try to power them up.