What is wrong with overkill! 32gb of ram sounds like a headache though!
I've found that 4 x 8gb sticks play well with Z77, not that 32gb is necessary.
To OP: As others have said, it's not the best configuration for the money. Most computer buyers fall into one of the following categories:
1. People who know about computers enough to understand the value of the parts you put in, but will have no use for it because they can build their own and probably have.
2. People who want to play computer games but don't know what they need, so they'll likely consult a company or friend rather than drop $3 grand on a PC they know nothing about, from a stranger on Craigslist.
But yes, there will be the occasional craigslist shopper who has more money than sense.
But honestly, your best bet is to dismantle the thing, clean/dust off the components real well, find any original boxes you've kept, accessories, cables, etc., and sell the individual parts on forums (and ebay if you have to, but they'll take 12.9% in fees between the listing and the paypal transaction).
PC components that aren't obsolete have a pretty good resale value, and you're likely to sell most or all of those parts much faster than you would selling a less-than-optimally configured overkill machine. This is just my opinion, having been in the business for over 10 years.