Chhosing a subwoofer

Hello guys, i am new to this (building my first home cinema) and its time to buy a subwoofer. My budget is 800 euro. At first i wanted to buy Svs sb1000 pro but i have read that it doesnt have so good explode bass and i really wanna have that for action movies. My second choice is klipsch R-121sw its half price but i can take two. Can you give me advice what to do or better then this two? I am in europe.