The push is an amazing piece of hardware. You won’t find it’s build quality, velocity, and after touch anywhere else. That being said you might want to play around with how a Push works, run multiple instances, or don’t have the money. There is an amazing work around out now for Lemur app on the Ipad. It is a template that has almost all functionalities as the Push.
This is a free template for download if you have the Lemur app. It can be used with Ableton Live to emulate the push. I haven’t used this with a push plugged in, but my hopes is you could use them both. So you can sequence drums on the ipad and play a lead on the push. I think this will open up a lot of possibilities.
The Lemur will not be velocity or after touch, so that is something to keep in mind as well.