recently sold a Naughty dog shocker as i was looking to down grade due to playing time, but ended up buying two guns (good sales man wicked price)
the new nxt is based on the ND shocker so if it's half as good it will fire ropes all day. my mate has a sft shocker and that also spits beautiful ropes of paint. He put a good 20'000 through it already and only had one problem( he never cleaned it).
other freinds have dm's and pm's and they love em and the dm's i've used have been trouble free.
personal choice, budget and what gun suits you is the best thing to go on. ask if you can fire your mates guns. try as many as you can before you buy.
i personally like the look of dm's and pm's and at the mo with pm7 out and the dm7 on the horizen the prices are really good for the dm5, dmc, pm6 so you could get a really good deal.