If you are comfortable buying used, then a SuperNait 1 or 2 would both outperform the XS and be within your budget.
The Unitiqute is another option. It doesn't have the punch of the XS, but it's a very solid one-box solution that also includes a built-in dac and streamer.
If you like the sound, an AX-7e might also be something to consider. At the same time, if you definitely prefer the NAIM sound, the Qute and the SN (used) should be on your to-audition shortlist.
Hope that helps,
The Unitiqute is another option. It doesn't have the punch of the XS, but it's a very solid one-box solution that also includes a built-in dac and streamer.
If you like the sound, an AX-7e might also be something to consider. At the same time, if you definitely prefer the NAIM sound, the Qute and the SN (used) should be on your to-audition shortlist.
Hope that helps,