im usually looking for the "best deals" when i buy stuff, but in this case id say go with sl1210 or dont go at all, i mean yeah u can use other stuff, but the technics are very reliable, they will last a long time, and i know the other stuff just wont do that (especially not numarks).
there are decks with new digital stuff like real master tempo, bpm-counters and ****, but in a pair of decks u really want as little as absolutely possible of those things, i have a pair of broken numarks they broke after 3 years, i only used them at weekends really, and only for spinning, first one broke (a capacitator died), so i changed all those on that board, then the week after the next one died with the same problem, fixed that one, and like a week after they broke again (same problem again). utter crap! these companies dont know **** about this kind of stuff, but technics do.
BUYING EXPENSIVE IS BUYING CHEAP IN THIS CASE, never forget that!