Considering the microphones, you could take a look at the Zylia :
http://www.zylia.co/
I have one, together with an Ambeo and a Brahma (I had a Tetramic too but it was too noisy), and the 3rd order decoding makes a real improvement, even if the mic quality itself is behind the Ambeo (but the price too !).
Being able to do the recording with a lightweight tablet is also a nice alternative to an expensive recorder...