I used a little Poulan electric last winter to cut up some 4'-6' green birch logs in the basement shop after snowfall. It did the job pretty well and had a surprising amount of torque for a cheapo ($90) but I eventually smoked the coil and burned it out after working it too hard for too long. It could cut faster than my Husky 50 does though, and was just as loud.
I like the looks of that Logosol, I was already thinking of building a similar setup but Alaskan-style, using the spare 3HP motor I have kicking around.
Alternatively, a local woodworking supply store has an attachment to turn your circular saw into a small chainsaw with a beam cutter type setup. The bar looks to be about 10" long at most and it looks like .043 chain on it. You'd probably want to have a good, heavy-duty saw though.