You have some airflow or heatsink mount issues if your temps are idle in mid 50s to 60s C.
Pull the side of your case, blow a desk or house fan on high into the side of your case.
If temps drop under load, you have an airflow problem. If temps remain relatively the same, you have an issue with your cooler.
Watercooling isn't going to fix your solution, especially if you want to mount the radiator internally...it still requires good airflow to function correctly. Please read through the watercooling sticky linked below.