77" C3 vs C4 - price difference

New to OLED - coming from 8 year old 55" Samsung 4K basic model.

Here are my current options for new units I already purchased and can cancel or deliver from Best Buy:

77 C3 - $1629 with tax, $110 cashback = $1519 net
can add 5 year Best Buy Warranty for another $300 = $1819 with 5 year BB Warranty

77 C4 - $1952 with tax, no cashback = $1952 net
can add 5 year Best Buy Warranty for another $400 = $2352 with 5 year BB Warranty

So the C3 is $430 cheaper with no extended warranty or $530 cheaper with 5 year BB warranty.

Is the C4 worth that much more? I can afford it, but it sounds like I wouldn't really notice much difference.

Also, should I go for the 5 Year Best Buy Warranty?