45Kg is 99lbs. Markins is very conservative in their rating too. I think your covered as far as the ballhead is considered. Legs....you might be pushing it.
The Q10 should do you for many years, and once you have some age and battle scars on your legs, maybe then consider upgrading to Gitzo or RRS set of legs. You SHOULDN'T ever have to upgrade your ballhead. The one your buying should with some care last as long as you want it too.
As far as macro goes. This is my current tripod. Nothing like it.
http://www.bhphotovideo.com/c/product/548396-REG/Gitzo_GT2531EX_GT2531EX_6X_Carbon_Fiber.htmlRoman
