For a stated budget of 1600 total..
pony up a little more and get a pair of Sierra -1 and a HSU VTF -15h.
likely 250 shipped over your budget but: no dust, got to have it extra tools, skinned knuckles, sitting on homer bucket trying figure out the next step etc.
I've heard the HSU in a room volume much larger than yours and found it quite pleasing. Plus, it's just the right size to be an end table
If you feel you need more evenly distributed bass later, Add another sub.
When you're ready, order the S-2's and move the S-1's to surround duty
my .02 cents.
Cheers, Mac