Fiio K5 Pro is 180€ via Audiophonics.fr
It gets recommended from time to time arround here, I am just not sure how the performance stacks up with the price change from US to EU.
Monolith Liquid Spark is 135€, as it is a amp only, you would need to get a DAC aswell.
With either of these, I do not have hands on experience and can’t speak for how well (or bad) these would pair with the 1990s. As the Liquid Spark got recommended in this thread I thought it may work for you.
The LakePeople G103-S is a more expensive option, you would need to get a seperate DAC with it (wich may bring you over budget).
Further considerations:
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You could get an Amp first and run it off your mainboard for now with a cable like this (maybe a bit longer
):
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Some DAC/Amp combo units do not have the options to feed them from an external source (phono-preamp, phone, etc.) or feed to seperate devices (speakers, different headphone amps, etc.)
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When you game, do you need voice chat?
If so, what kind of microphone do you have in use (xlr, usb or modmic-style)?
In case of XLR or headset type mics, something like the Yamaha AG03 my work nicely for you. From there you can hook up your Mic, headphone amp and still have an option to hook up to powered speakers