I'd have to say that Isla is the best RB in Italy right now. Maicon has been injured and not the same as in the past years but is slowly getting is form back. Cassani is doing good. Lich ok.
If I had to pick one right now that's affordable it's Isla. Saw him LIVE too with Sanchez. Sanchez sucked big time and was too individualistic.
Isla is solid defensively and can create some offense.