Hi Endorya, tudo bem ?
I don't know if is too late for some information, but I have a DR-07KMII and now I got a DR-40.
Both are great machines. I got the DR-40 mainly because I need the overdubbing without mixing and I got a super deal at Amazon for just $91. I use it more with voice and guitar and sometimes with movies.
One important thing I can tell you, it is about the balanced inputs. It really needs a balanced mic or whatever, if the source is not balanced you get a noise and it is noted at TASCAM website, DR-40, FAQ.
Other than that everything is great, easy to use, and so.
Um abraço