I have seen the Sirui in action. Carbon Fibre, not in the class of Gitzos, but still manages quite well. A D700 + Tokina 11-16mm and Lee filters.
1204 or 2204 is quite ok. Legs alone, I think is SGD 260 and 280 respectively.
Go to TK and check it out. I am not affiliated to the shop, just thought they offer gd price, and quite gd service, and some gd products.
Not sure if this thread shd be in Pentax sub-forum, but just to relate it to Pentax cameras, the Gitzo 1541T is ideal as a travel light tripod setup. As I understand, the 1204 will be a gd travel light setup. But for 20 dollars more, you get a more stable setup with 2204, and not that heavy as well.
Best is to bring your camera and lens and test it in the shop.