Mpc2000xl?sp606?rs7000?, anyone got advice or opinions? Options

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Well i posted a forum topic some days ago on the sp404 and i pretty much answered all my questions myself,The hardwear world is so new to me!!:P I've been working with mainly fruityloops,cubase,reason and soundforge on the side for some years now and i'm trying to get rid of my computer so i can do more listening and less looking:P
Anyway,i figured out that the 404 is not what i need,to limited,i'm looking for a synchronizer/sampler (chop function is a must!) for instrumental style hiphop that can be used for live jams as well (especially the live drumming mpc type of stuff).The mpc2000xl,sp606,rs7000 all seem pretty interseting,they all have there ups and downs:
-2000xl,i've seen some shows with these (jel,alias,ring a bell anyone?)and i love the live drumming aspect of them.i would have to get a second hand one cos of the price and i dont like the fact that for that kind of price you dont get any effects or decent amount of memory
-sp606,seem pretty good all round,i like the 40 onboard effects,but a 4 track sequencer?!?! what the f*ck! seems way to limited
-i havent been able to find any real down sides to rs7k but i get the impression its more for electro/techno styles,is it anygood for live drumming (i love those 2 words:P) and sequencing?
So if anyone has one of these machines please give this hardware novice some advice!!!:)