I see many affordable options. Is it fairly simple to migrate the node from the raspberry pi?
Discussion
Yep. Should just install the SSD. Flash the SD card with the latest version. Start the install. It will ask you if you want to restore.
Backup the old Start9. Including any lightning channels. Take it offline.
Then restore from backup on the new hardware.
As always. Double. Check their documentation they do a really good job of explaining how to restore from backup. The import this is to not let the Channel states change between the backup and the restore.
My dell build synced the full bitcoin chain in like 27hrs. Versus like a week with the pi.