The lastest statistics from the MLS for the Green Bay/De Pere area is that on average homes are selling for about 93% of list price. On an individual basis, however, the price accepted will depend on the seller's motivation, financial situation, and how much activity they've been getting since listing or reducing their price. It's hard to say if $168,000 would be too low without knowing the property condition, listing history, or comps of similar homes in the area.
As far as basements are concerned, a finished basement typically gives a home more value and a higher price than an unfinished one. However, if you think of it from the angle of investment potential you may get a better deal with an unfinished basement. If there are daylight or egress windows in the basement you have the opportunity to finish it after you buy it and increase your square footage and potentially your future resale value.
I'm an agent in De Pere and deal with a lot of properties in this area. I definitely recommend a buyer's agent to help you find your home, handle the negotiations, and coordinate the inspections, closing, etc. Give me a call or send an email at any time and we'll chat to see if I can help you out.
Resource One Realty, LLC