Reply to CDJ1000 mk 1 vs 3

I'm wanting to switch to CDJ's. I've had a play on 850's cause they are the "lowest" ones I can rent from my local shop, but I'm looking at CDJ1000's. I'm just wondering if it's worth it to pay a significant amount more for Mk3's if I'm not particularly interested in the mp3 CD ability? I can get my hands on two Mk1's for $650 total.

Wondering if there is any other benefit of the MK3's that I have overlooked in my research?