I would suggest Yamaha PSR-E243 for learning. Its a good keyboard for learner and I am using this for a year n half now, love its sound.
PS : I felt that playing music with 88 keys takes a lot of time (may be false for you, also depends on dedication towards it).
1. When I connect it to laptop and switch on USB I am unable to transfer files via USB.I am getting a "connection failed" kind of error. I am able to transfer files via bluetooth though. (Solved this. "USB debudding" should be enabled. Goto settings-->developer options-->enable "USB debugging"...