It can be very difficult in stores, as packaging can vary and as an example, the TDK disc you buy 1 week, may not be made by the same manufacturer when you buy them next time, even though packaging is the same. Any discs that have " made in japan " on the packaging will be of very good quality, as these are normally Taiyo Yuden manufactured.(regardless of brand).
I have always been a fan of Verbatim discs and the current ones i have,(DVD+R 8X) work beautifully with the 4163, and at 12X
There was a link which posted to pictures of packaging and what the discs were, however i cannot remember it and last time i looked it was a little out of date.
I am sure many others here will be know of "store" products which are good discs for your LG.