Hey @Curt Bixel,
Easiest answer first, Buildertrend can break it out as detailed as your contractor is willing to do. We use Buildertrend for all of the Architectural and Construction projects.
Second, I definitely agree with @Eric M. With our subs and when working with other GCs we always do at least 3 bids. Lots of good advice about comparisons and asking questions. Very important to get a better idea of what's being included and what's not. A good GC with experience has backup for the pricing they're giving so they should be able to support their numbers. Also as you may have seen in some of the forums, not all GCs are created equally. Some have higher overheads and other things that cause them to have higher markups. There are some GCs better suited for investors and others more appropriate for retail/market rate clients. It all depends on their structure and experience.
Last thing, with all of that said, you're actual numbers are probably closest to the higher guy. You absolutely get what you pay for and more often than not in our experience, the cheapest guy has almost always cost more in the long run and when the job is done right, the actual cost has usually been between the 2 highest bids.
Hope this is helpful. Happy to answer questions if you want to chat.