I was out at a popular tourist spot and saw a photographer with the smallest RRS tripod and smaller ballhead combo... played with it a bit, only about 2 pounds and 4 feet high but very solid and perfectly made. More expensive than your camera but you could opt for the Chinese or Gitzo versions that are 98% as good. If you are going to use a light camera like a Tachi then it seems silly to have a heavy tripod. Just pray for calm winds and low subjects.
A 410 head for a Tachi is way overkill. A good ballhead would be fine for it, you aren't aligning lasers here.