Once again thanks everyone for helping with the bike selection process! ^_^
The test rides were awesome and I am really happy that I went with mtb, it allowed me to discover lots of fun places such as these:
Also I found there three guys on motorcycles and all covered in mud who were doing approximately the same stuff as me
The ride to work has been quite successful too, I really can't imagine leaving those fields and trails for a busy road even if it would make difference in travel time.
Also I love the sound that wheels make when I ride fast enough and they push air apart (usually on paved road)