I am planning to pickup an auger attachment for our DW SK650. The plan is to use it to assist with planting projects, and the occasional fencing job we do. I am seeking some recommendations on what size augers to get? I think I'd only like to purchase two or maybe I can get by with one? I'm looking for advice. Most our planting is containers #1, #5, #10 with occasional b&b plantings (maybe 50x a year) Then a secondary questions is it practical to use the auger bit 3 times next to each other in a triangle pattern to create a bigger hole? Is there any where else we may use the auger in landscape I'm not considering as part of auger size purchases? I might do a few deck footings from time to time but that's like a once a year job. Thanks!