If you can wait until the Christmas shopping season, that's when some REALLY good buys are available. You will find retail stores like BestBuy, Walmart and Target offer some great keyboard sales at Christmas.

Yamaha and Casio are two keyboard manufacturers that have several student models that either offer built-in lessons or have lessons on the internet. Casio even has a keyboard with keys that light up to guide you through a lesson.

You didn't mention it but you'll likely want a keyboard with RCA plug line out connections. That way you will be able to run the keyboard's audio output to the audio inputs of your PreSonus AudioBox USB96 interface and use the USB connection for transferring MIDI data between the keyboard and your computer.
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Jim Fogle - 2021 BiaB (842) RB (Build 8) Ultra+ PAK
Cakewalk - Zoom MRS-8 recorder
Desktop: i7 Win 10 build 2004, 12GB ram 256GB SSD, 4 TB HDD
Laptop: i3 64bit Win 10 build 21H1, 8GB ram 500GB HDD
Music at: http://fogle622.wix.com/fogle622-audio-home