Owning an SB1000 myself....pony up another $200 for the SB2000 and you won't have any regrets!
Love my son's SB2000 more than my own, which is what prompted him to upgrade his Sony down firing when I let him take my new sub and "break it in for me." We're both so impressed at how much better the next-level-up unit really is.
BTW, the SB2000 is only (on average) about 1-1/2" bigger in each dimension than the SB1000. These are both very compact units.