If you do consider a 4.8 I would be sure to drive both. IMO the feel is very different. Not saying one is better than the other but they are different enough that one or the other will be your preference.
I don't think the price is out of line depending on your level of attraction to the 4.6. There are never many for sale so I do a search nationwide
https://www.cars.com/for-sale/search...20142&zc=75068