Are the subs DVC 2ohm? If so, you would be wiring the pair to 2ohm and you would not get much power. 1 DVC 2ohm RE SX10 would do great on that RD1000.1
remember teh power handling spec of a speaker is only a thermal rating, not a measure of the power it requires to reach full excursion. An SX should reach Xmax with a little over half it's "rated" power handling. The coils are just beefy and can take more heat without damage.
ive ran the 04/05 model SXs with a lot more than rated power.. although i would not suggest doing so without being sure its in an enclosure built to spec and a clean signal.. and of course without abuse from the user
but in all.. i'd run the 1000.1s strapped if your budget allows so
you could run the 1750.1 @ .5ohm but for daily i really don't recommend running under 1ohm even though many amps such as that would will be fine giving a few circumstances