I came across this older discussion and wanted to add my two cents. I’ve owned a Hyundai ix35 with the G4KE for years. When the engine started knocking, I wrestled with the same decision. A new long engine cost around $3000 installed, while a used car with unknown history was similar. I went with the engine swap and got another 100k miles. What condition is your SUV’s transmission and frame? Those matter too.