Second that, BUY Aspire Nautilus! The Aspire Nautilus is the best clearomizer out today, it has very good airflow and has been a great performer over all Pro tanks made to date!
I own every ProTank made, uni tank, pro tank, pro tank 2 and 3 and aero tank, plus Pro tank Mini and Mini 2 also, I would trade all of them for one Aspire Nautilus! In fact I havent used even one of my pro tanks since i got my Aspire and wish i wouldnt have wasted the money on them, they sit in a box collecting dust!
Buy the Aspire Nautilus, you will be very pleased and no its not a Rebuild tank, it takes Aspire replacement coils just like the protanks use coils!
Good luck!