I'd say yes to using that Numark, sounds pretty decent.
I love the flexibility of a dj mixer in terms of gain, numerous options for volume control, number of inputs and mixing (duh) when used as a pre.
And while many dj mixers aren't that great sounding, there are even mixers with
excellent sound quality out there, like;
-Denon X-1700; will match a LOT of Hifi pre amps in terms of sound quality.
-The current generation of Pioneers
-Most A&H's (phono stages aren't that great on both pio and A&H though) are pretty good too.
-Vintage Bozak (and Urei) mixers very nice (but prohibitively expensive due to their reputation).
-ES rotary mixers (A la Bozak/Urei) are probably the best sounding dj mixer you can buy new;
http://www.electronique-spectacle.com/
-Stanton VRM 10, but this unit is unfindable
Mixers that I used for a longer period and liked the sound sound quality of are;
Urei 1603, Gemini UMX series, (most) Ecler, (most) Rodec, (most) Dateq.
I use the Gemini UMX to date (messy setup, I know..);