You would likely be very fine even with two SB1000 Pro´s if you feel the bass is transfered very easily to neighbours and especially as you have them below you which is not good. I used subwoofer as nearfield by the couch in apartment (1st floor though), didn´t have to run it so hot and still got good impact without bothering neighbours too much. This is quite popular trick for apartment use. As you have open space it will be intresting where the subs are best placed and with this in mind something good looking and small will surely help if you need to sell different type placement for wife. I mean if she thinks that the two cute boxes go at front wall aestetically pleasing way, but is that second sub then contributing smoothing the response.. Not necessarily.
Could you consider the 1723 S Bookshelf with 1723 S Centre? It would be more in line with SVS Ultra and someone here found the Arendal 1723 better. Was it
@Quorra who had Ultras earlier? Also in youtube video review (ThaVillaMan?) Arendal was prefered over the Ultras. Notice the 1961 Monitor and Centre are not "full size" speakers, but the smaller size is likely more wife friendly in apartment living room.
Naturally you don´t need to match the sub & speakers, but if you feel same finish is required then of course..
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