Keyboard recommendation for Mainstage 3

Does anyone have a suggestion for a good quality midi keyboard to use with MainStage 3? I play at local gigs (bars and parties mostly) with a rock cover band. My main keyboard is a Yamaha CP4. I'm considering adding a midi keyboard with MainStage. The reasons are 1) I'm not crazy about the CP4's organ sounds 2) I'd like to try using a second keyboard instead of always using splits when I need more than one sound, and 3) I like to avoid spending the money for something like a Hammond SK1 or similar. I don't need more than 49 keys. All that said, I'm open to all suggestions. Thanks.