You'll probably have no audible artifacts at 4.99 and above. You may want to do a listening test and see if 4 or even 3.something is enough to sound good to you. It's pretty subjective, some people claim 3 is usually "good enough", but I'm not even close to an audiophile and I can hear a marked difference below 4.
I was away for a while.
But I'm feeling much better now.