I'd suggest either the Aspire Nautilus Mini/full size with the BVC coils, or the Kanger Subtank Mini using the 1.2 ohm factory OCC and replace the mouthpiece/drip tip to a smaller more restricted one. Either of these would be a nice upgrade from the system you now have. The Kanger Subtank would be better if you do lung hits, or replace the drip tip if you are a mouth to lung vaper. I have both and use both every day.
The Subtank Mini has a rebuildable deck which is nice should you decide to grow into the coil building aspect of vape. The 1.2 and .5 ohm OCC coils can be purchased if you just want to replace the coils, but keep your old burnt out ones because they can easily be rebuilt as well.