. . . . Music Maker and looking for a usb keyboard . . . .
I would suggest you visit your nearest music shop that has keyboards, both MIDI controller type and full keyboard instruments which have USB controller capabilities, and have a play with them.
This way you will find what is best for you in terms of key weight, key balance and touch.
I would not recommend a particular make / model because what would suit me may not suit you.
I would recommend however, that you go for one of the well known brands with at least a 49 note velocity sensitive keyboard with Pitch bend and Modulation wheels.
Smaller keyboards eg 25 note ones mean you are having to use pitch up / down buttons to play a wide range of notes.