If you're listening near-field at moderate levels, I wouldn't worry too much about power. Looks like the PSB sub has an adjustable crossover, so it'd be fine; it also has speaker level inputs, so you won't need a sub out option.
Do you need a digital input from your pc, like usb?
prpixel has some great suggestions above.
However if you don't have the speakers already (confused since you listed two options), you may want to consider active monitors such as the KEF300A
https://www.amazon.com/KEF-X300A-Digital-Speaker-System/dp/B00AXYKF30/ref=pd_rhf_dp_s_cp_2?ie=UTF8&a...
or the Audioengine HD6
https://www.amazon.com/dp/B017E10MPU?psc=1&smid=AKR88PAWTQVN2
Do you need a digital input from your pc, like usb?
prpixel has some great suggestions above.
However if you don't have the speakers already (confused since you listed two options), you may want to consider active monitors such as the KEF300A
https://www.amazon.com/KEF-X300A-Digital-Speaker-System/dp/B00AXYKF30/ref=pd_rhf_dp_s_cp_2?ie=UTF8&a...
or the Audioengine HD6
https://www.amazon.com/dp/B017E10MPU?psc=1&smid=AKR88PAWTQVN2