I am also a beginner in Robotics but I've used Arduino for a while now.
I think you can do a lot more with Arduino type boards. I've started a project which sounds similar to what you suggest. A connection between smart phone / tablet and an arduino controlled robot over bluetooth. I'm using the mega2560 board.
I'm sharing the project here as it develops: http://gampageek.blogspot.co.uk/2013/05/blog-post_3714.html
. It's very raw at the moment but I have made some progress and posted code and hardware designs.