2009 100K maintenance??

[bmoore55]

I have a 09 Tahoe and have had no problems! I have always had the "regular" scheduled maintenance performed and the rear brakes replaced at the last oil change. I called to get a quote on the 100K mile service, and even asked what the "most important" service would be, this is the information I got: first thing that needs to be done is plugs/wires and induction service at $500, then transmission service $131, coolant fluid/flush $89, differential service $178, and eventually powersteering $80, and if any belts need to be replaced $145 (serp). What is more important sevice to perform? And are these prices universal? I certainly don't want to be hasseled by anyone. Thanks!!