I am in the market to purchase a bed edger for next season. The main purpose that we will be using the machine for is to create an edge along mulch beds that are not bordered with any type of landscape stone. We do not get too involved in full blown landscaping - laying pavers, etc. Anyone have any thoughts on what bed edging machine I should go with? Are there special blades, etc? I have seen them before, but pretty green on the idea and how these items operate. Thanks for any assistance that you can provide.