It sounds like you have invested alot of time and money into your home. I'll bet it's very nice.
Although the market took a big hit starting in late 2007-2008, things are improving. With the new roads giving much better access to Eagle Mountain, and with all the business and commercial development coming in right off of the Alpine/Highland exit, demand in your area is up and the inventory of homes is way down, all of which should help your value.
One really good option is to invite at least a couple of different, experienced, local agents to meet with you, explain the market in your area and give you a detailed opinion of what the selling price could be today. Sounds like you are hesitant about involving an agent but, statistics show that is still gives you the best chance of selling for a strong price.
You probably know some people right in your area that have purchased or sold recently that could make a good recommendation on an agent.
Teri Jerman agent with Pine Valley Realty, Alpine Utah 801-372-9035