I've been using a Pioneer DJM600 at work for the last 2 years. It is 4 years old now and the quasi pristine sound has turned into sizzling mush at high levels. The BPM and beat division buttons don't work anymore. So much for industry standard.
I got a 3 year old Rane MP44 (chosen over an A&H Xone:62) for personal use and could not be happier. Crystal clear sound and it is built like a tank. The overload limiters are transparent and fairly effective in keeping levels in check. And yes, the FlexFX and master loop inserts are quite handy for outboard effects. I plan to get an Electrix MOFX for just that purpose.
It is 5RU and 5.3" deep plus the connections are at the bottom rather than at the back so this mixer is not very practical for mobile use. I would definitely recommend the Rane Empath for that purpose. Same build quality and features plus built in compression for the knucklehead redliners.
If you insist on getting something similar to the Pioneer DJMs, the Xone:62 would be a good choice, albeit the efx. Definitely better sound but word is that it can take only so much dust and abuse. You can also check out the
Soundcraft Urei 1603 and
Ecler Nuo 4.
If not, there's always Behringer. I've got a DJX700 that you can have for free if you pay shipping. The channels crackle and the effect have gone kaput.
V.