Originally Posted by Lolvoguy
Considering my audio source is my PC, I don't imagine (even with the best tube amp) that the investment would be worthwhile.
As somebody else noted, pushing digital audio through a tube amp doesn't make any sense, and that's beside the point that MrHorspwer made in his excellent post, that the unit you linked isn't a tube amp.
How much money are you looking to spend here? What's the quality of the source material? You can spend thousands of dollars in a blink of an eye on this stuff. My B&W 802's are currently at a friend's house (we have music nights) hooked up to his huge monoblock tube amps (real ones) because he wanted to hear the "Abbey Road" speakers compared to his custom ones. He has a very nice tube pre-amp and a high-end turntable with custom tone arm. His setup is WAY more expensive than mine and it's 100% analog, hence the tube gear. For digital music, he uses a Bryston transistor amp, like I do.
The other question here is what medium are you using to connect the computer to the stereo? You can do RCA's, where the computer is doing the D/A bit (usually not ideal), Toslink or digital RCA into the stereo or into a dedicated DAC, which I assume isn't the case here. From the systems you linked, and their price, it appears you aren't trying to blow the bank, so perhaps something nice and likely used from AudioMart could get you into some better gear than you otherwise would have bought. I'm a huge fan of Bryston, as they are local, but they are also insanely expensive, even for their used gear.
If you are looking for bookshelf speakers, these would be an excellent choice:
https://www.canuckaudiomart.com/details/649540006-paradigm-micro-v2-bookshelf-speakers/
Or, if towers fit the bill, these Paradigm ones are well priced:
https://www.canuckaudiomart.com/details/649541070-paradigm-90p-v1/
This Rotel amplifier would be a great choice to power them:
https://www.canuckaudiomart.com/details/649542244-rotel-rb-870-with-upgraded-binding-posts/
And for a DAC/Preamp, again, not sure of the budget, this Cambridge piece is quite nice:
https://www.canuckaudiomart.com/details/649530359-cambridge-audio-dacmagic-plus-black-new-open-box/
As is this Emotiva DAC/Preamp, for less money:
https://www.canuckaudiomart.com/details/649541309-emotiva-xda-2-dac/