We moved to Appleton from Maine 11 months ago. The crime rate is VERY low and the schools appear to be good, although we don't have kids so I can't speak to specifics.
For 150K, you should definitely be able to find a nice older home in an established neighborhood. I think you will prefer the older homes as the new construction is all stuck in what used to be farm fields and there are no trees in the new developments because of that.
Check out this website as it's the best in the area. They cover not only their own listings, but those of other agencies as well, including all virtual tours that are available. It saves you from having to jump from site to site.
http://www.coldwellhomes.com/
Most of the roads have been resurfaced, but there are still a few bad ones remaining. I would recommend staying away from those streets because you will receive an extra bill for resurfacing the streets and sidewalks, over and above the very high property tax bill. The better neighborhoods are done however, so you should be fine.
My dislike of this area is well documented so I will not repeat our experience here. You can do a search if you want an "outsiders" point of view. I do wish you all the best with your move and hope that you find Appleton to be a good fit.