Would a 4 be an unnecessary overkill?You can get everything you need from here.. SD card, power and caseRaspberry Pi 3 Model B+
Raspberry Pi 3 B+ (plus) is the latest generation board released in 2018 by Pi Foundation. We offer overnight delivery, free support, and all the accessories.core-electronics.com.au
YES...Would a 4 be an unnecessary overkill?