Replying to Which Tripod to Buy? +K for any advice

Currently in the process of purchasing a new tripod. I own a 60D as of now and I mainly shoot video, barely any photography. I've narrowed my choices down to three tripods, and my budget is anything under 900. The tripods are the Sachlter Ace, Sachlter fsb4, and the Manfrotto 501HDV Kit.

(Ace, 535 $)

http://www.bhphotovideo.com/c/product/822105-REG/Sachtler_1002_Ace_M_Fluid_Head.html

(Fsb4 800 $)

http://www.bhphotovideo.com/c/product/601879-REG/Sachtler_0372_0372_FSB_4_Aluminum_Tripod.html

(Manfrotto 501HDV Kit 550 $)

http://www.bhphotovideo.com/c/product/683566-REG/Manfrotto_501HDV_546GBK_501HDV_Head_w_546GB_2_Stage.html

Any reviews of the tripods or advice is greatly appreciated! +K will be given