SMSL or Topping one will do the job. I've got a Topping which I use with a pair of Roth speakers.
£70 difference between the Steljes and QA 3020 + amp. NS3 have a built in DAC too, so if you are using onboard audio, adding a DAC or sound card might end up costing £100+ more. NS3 has Bluetooth as well.
Trustedreviews.com gave the NS3 a very good review, saying that their sound makes a mockery of the £200 price tag. For £130, that makes them great value for money I would have thought. Hard to see how the QA speakers + T amp would be worth the extra £70-£100.
If they were £200, I'd probably go for the passive speakers + amp, but for £130, they are hard to ignore.