For myself I know I prefer the lower extension of the EP500/600 vs the EP350. I would go for an EP500 or 600 depending on your budget and if the much larger 600 would fit. Then add a second if I so desired or felt something was amiss in the FR with just one sub.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70