that i am not sure, but it is quietest and has 92MM fan on it, and is considered the best (dry fan).
there are 2 versions coming, 1 is AL-CU (aluminium and copper) and other is Copper only, but CU only will be expensive and will be heavier. typical weight is 780 grams.
will cost around 20£ (i'm from UK) so check prices for USA as if u r from there.
the model 7000 comes with 92MM fan and i believe they came up with 7700 model number as well with 120MM fan. that will obvioulsy be huge and heavier (aroung a KG)
and you cn check out their website for more information, as its been log i didnt went there to see what they are up to now.