Get a mini with a bmg and the 38 special. Carl could price you out, but my guess, you'd be right around $35k, give or take a few thousand. Seems like a lot but you can do so much more. 100 hours a year is nothing for a grinder, so the 38 special would suit you well. Do yourself a favor and go that route, instead of a dedicated stump machine. Telling you, you'll be thanking yourself and wondering why the hell you didn't do it sooner.
Which would you rather do, spend $30k on a dedicated machine you can only use for one task and that gets used 100 hours or less a year, or spend $35k on a multi task machine you can use for any number of tasks that'll get used at least 400-600 hours outta the year, while making you more money, and saving your body, while upping production two or three fold without adding another employee.