Welcome Rob. My personal choice is the Bosch 1617 combo kit. I like the feel of it better than others I have tried. This is not to say it is the right choice for you. Only you will know which is the most comfortable for you. As far as the Hitachi, make sure you are talking apples and apples. The KM12SC is the single speed combo, the KM12VS is the soft start/variable speed version. Both sets come with guide bushings. The component most likely to fail in any electrical application is an IC chip. For this reason I prefer to use the standard on / off switch version. You can buy a larger aftermarket speed controler (which should stand up better) on sale for as little as $14. Since we have recently seen the KM12SC for as little as $89 at Amazon.com I must recomend this as a super value. Reported prices on the KM12VS seem to average around $167, still a good value for your money.