450,000 monthly searches means this is no reg fee domain. The .NET is a huge handicap considering this is not a network/ISP type business. The .ORG would be much more valuable.
Mid to High $xxx. IMO.
Disclaimer: Please keep in mind that this is a FREE appraisal. This is a guess at quick flip resale value not an unrealistic end-user price. Often times my appraisals are rushed, too low, or too high. Sometimes my advice is totally wrong and occasionally downright dumb. If the post stamp is after 5:00pm EST, the chances are even greater that inaccuracies will occur due to blood alcohol levels.