Curve ball rec here, what about the Chord Mojo? No clue about synergy with your current amps but the DAC seems pretty high performing for its price point if you like the sound. It technically meets all your requirements because it can be had used in your price range, you can run line out (sort of) from the 3.5mm and just use a 3.5mm to RCA cable, and it also has Toslink and USB in. Plus you get the added benefit of having a pretty solid mobile combo unit for if you need to take it on the go.
Spontaneously I would have said
Ify zen dac
The Allo doesn’t look bad either.
Topping D30 will be slightly over budget but not necessarily wrong.
Would be my suggestion considering the G103 is probably typically German neutral tuned and apart from functionality a bit of warmth couldn’t hurt.
Alternatively, I would have said check Audiophonics.com and see if you can find something appealing.
Yes, you are right.
The Dac also had something wrong with the interpolation, which was also fixed for information only.
With the L30, I would certainly leave it alone.
I don’t think it’s a big deal for the E30.
Otherwise, if Mon says the Allo is a good choice, you can definitely trust him.
His suggestions have always been very helpful and correct and have never disappointed.
With the Allo, it would still be good to know with smpt or without ?
Probably with, but also consider the import and VAT for Germany.