You most likely will be happy with any modern, name brand keyboard such as Casio, Yamaha, Roland, Korg or Ketron. Most modern keyboards don't have 5 pin midi jacks but instead move midi over USB. I would start by looking at whatever brand your last keyboard was just because you'll have some amount of familiarity to start with.

Lots of online and brick & mortar stores sell most of their keyboards at Christmas time so if you can wait a month or two you will find the best bargains.

Yes you will be able to use the keyboard sound module with Band-in-a-Box but you may end up sending the analog signal into the computer through the line-in connection on your computer so, if that is important to you, make sure whatever keyboard you purchase has line out ports (normally round red and white RCA connectors).

There are a good number of keyboard musicians on this forum so I'm sure they will have additional advice.

Jim Fogle - 2025 BiaB (Build 1128) RB (Build 5) - Ultra+ PAK
DAWs: Cakewalk Sonar - Standalone: Zoom MRS-8
Laptop: i3 Win 10, 8GB ram 500GB HDD
Desktop: i7 Win 11, 12GB ram 256GB SSD, 4 TB HDD
Music at: https://fogle622.wix.com/fogle622-audio-home