Keyboards are my primary instrument. I'd recommend a Yamaha P-115.
https://usa.yamaha.com/products/musi...115/index.html
New would be more than your budget, but you may be able to get a used earlier version (A) in that price range. They recently updated the line with the P-115B. The B series is essentially the same unit with the addition of several extra drum patterns and an app that lets you control it with an iPad. I traded in my A series to get the extra drum patterns. The app alone isn't really worth it, but the additional drum patterns were worth it to me.
I've used it on small gigs with the built-in speakers alone, and I use it as a midi controller with Logic, thru an Apogee Quartet. Works great. I got Guitar Center to sell me one for $500 with one of their discount coupons.