Out of the ones you've listed the belt cp is the best, but if you're looking for something easy and relaxing you've chosen the wrong rc. Heli's are the most demanding in terms of concentration required, great fun but not relaxing... especially when you're first learning.

The lama V3/V4 and the CX/CX2 are all co-axial heli's, very stable and easy to learn on but outgrown quickly as well. Unless you're just looking for something to fly indoors or on days with NO wind then look for something larger.