I've not looked at the Redfield, but have used a Theron Saker. It's well below your price and quite a good spotter IMO. For me it bested a Pentax and NikonI was using at the same time that each cost more.
http://predatoroptics.info/catalog/subcat.asp?MfgName=THERON+OPTICS&cid=199&ret_id=1185759
