The price is fair. Check with the dealer, they will concur. Synthetic oil isn't cheap. The 6.1 HEMI is a great motor and it deserves the best.
ALSO... you really need to follow the manufacturers service recommendations if you ever hope to have anything covered under warranty. I had an engine problem pop up in my 2007 Ram 1500 5.7 HEMI and the service contract people wanted STRICT and accurate service records. Thats hard to do when you do all your own oil changes, tire rotation and trans service as I do. The bill for my repairs came to $3800 and I was dang lucky that the dealership went to bat for me. A member of my local MOPAR club had a similar problem...Her Caravan had paint peeling from the roof, and they wanted oil change reciepts as well. This is no lie. What the heck does OIL CHANGES have to do with peeling paint? They said that the oil change records is a testament of how well the vehicle is cared for. What a travesty.