As Amanda said, it would help to know what you're currently using and what sort of mod/battery you're going to put it on.
The Aspire Nautilus (5ml size) with BVC's will work best between 8 watts and 18 watts (most seem to report 11 to 13 being their favorite from what I've read, but this is entirely personal preference and juice dependent). Any 10-15 watt device will run it quite well (So, VAMO, SVD, MVP) and any 20 watt or higher device will be able to realize the full potential although you may not need it. The bare minimum, in my opinion, would be a variable voltage spinner/twist style battery, at max setting - it works, but isn't the best.
Kanger Aerotanks / Genitanks work well too, and wouldn't be a bad choice in the same range of clearomizers as the Nautilus if you want something different.