Getting 2 subs

Got a pair of Bower 802D3 which I’m biwiring 1000 watts to each one, been through several subs, just sold my pair of JL f112, which did not give me the thunder I wanted so I’m going back to SVS , I had 2 sb2000 before, but this time I want a brand new sb 4000 and I wondering if I should have me second sub be a sb2000 or the 3000 or match what i already have which is the 4000, I want to be the one to hear and feel it in my living room, not my neighbor,

my experience with large subs is that the frequency is to low and for me to hear close up , so is it ok to get 2 different size subs to cover a wider spectrum of bass or get 2 matching subs?