Trunk Insurance vs. Car Insurance?

I recently changed cities on my auto insurance going from a Cleveland, OH zip code to an upper middle class Cleveland suburb and my rates fell more than $200/half...I drive a '99 S-10, just a regular pickup truck, I am in the market for a new vehicle and ideally it would be a full size truck (Chevy Silverado or GMC Sierra half ton)...my agent has the exact truck I would like to buy, so I asked him what that truck would be insurance-wise for me. It automatically went back up to what I was originally paying in Cleveland...around $650/6 mos. Other variables of my car purchasing ordeal are that I took a buyout from General Motors and I got a vehicle voucher included in the buyout, so another option for me is to get a Chevy Malibu which I could basically drive off the lot for zero money...I've been reading that sometimes car insurance can be more than insuring a truck, with the information I've provided can someone help me out and estimate if my insurance would be more for a basic/no frills 2011 Chevy Malibu or a 2011 Silverado/Sierra with some bells and whistles...and also, do Insurance companies look at the more options a vehicle has as being more to ensure??? any answers would be appreciated