Stihl. http://www.stihlusa.com/products/edgers/

I'm partial to a wheeled edger. Grew up in California with a series of Power Trim, McLane, and King O'Lawn machines. Never heard of Little Wonder until I moved to Jersey. The two best in my opinion are the Power Trim and the Little Wonder. They range from pro-sumer quality in the $500 range to models for professional gardeners up $800 or more. For your use a Little Wonder 6002 or a Power Trim 200 or 200-4 are probably best. Both retail for about $500 to $550 and if you shop can be had for $450 to $475. Both are fitted with Briggs 3.5hp engines, and if serviced regularly the engine will last a lifetime. Edger service is much easier on an engine that mower usage. Edger engine also sees much fewer hours than a mower. Key is regular oil and filer changes. A step down, but still a credible machine is the McLane. I recommend the 101 or the 801. Both have four wheels and come with Briggs 3.5hp. List price is about $425 although they are often flogged on the internet for about $300 - $325. Pretty good machine for home use, and again Briggs is good in this application. Downsides are plastic wheels and generally less robust construction. Whatever you do avoid the McLane 137. It only has three wheels, and the front wheel is fixed. For less than $10 less at list price, it is not a good value proposition. I currently use a Little Wonder 6232 Commerical with the Honda. I got a good deal second hand (paid less than $350) and love the edger. However, I could not justify the expense of the Honda if I were buying new ($850 - $900). If you need to go cheaper than $300, a stick edger or string trimmer may be what you need. I don't think they edge as well, and are more tiring, but that's the trade-off.

Most edger mowers on the market take the same size 9" blade.

Both machines have the Honda GX120 OHV engine, which is one of the best in the marketplace. So that's a wash. McLane is a consumer product and tries to get into the low end of the commercial market. The Little Wonder 6232 and the Power Trim 3008H/308H are both high end commercial products. For example, McLane uses plastic wheels where as both Little Wonder and Power Trim are all steel. Swing arm construction and mandrel bearing are superior on the Power Trim, and the Little Wonder is arguably even more stout with double belts to the mandrel, although L-W will not rotate blade for bevel cutting. On the other hand, this model McLane is in the $600 bracket where-as the Little Wonder and Power Trim are in the high $700 price range. I'm sure the McLane would more than satisfactory for your "home only" usage, but you're not comparing apples-to-apples with the other two. I've owned all three, and currently have a Little Wonder 6232 with GX120 Honda. I'm equally fond of the Power Trim, especially the 308 with the large front wheel, but Power Trim is not widely distributed in the Northeast. Frankly, the same models with Briggs engines are very capable, and will provide 10+ years of homeowner service if properly maintained. In summary, you won't go wrong with McLane, but understand there is a reason and demand for the more expensive and better constructed Little Wonders and Power Trims.