@Plumes.91 beat me to it, I was also going to throw out the Tesla Two, which I also have and is great. It will support down to .15 or maybe .18; the newer version may be all the way down to .1 but I'm sure it will support your coils either way as I often use .2s on my older one. It has an internal battery and it's quite good. Some places call it a "100W" mod but as it's unregulated I don't see how this is the case, even with a MOSFET. I believe it can do a bit more with a coil of suitably low resistance.
Similar to the above, there is the Tesla Invader 2 (I'm pretty sure that's the name) that will take either two 18650s or two 26650s, though it's correspondingly large.
Depends on if you want another unregulated or regulated, and whether you want to buy spare batteries. I have 3x Samsung 25Rs in my Rx200 and they were like $5 each;
@Asylumsix is right that you could get even more life out of LG HG2s they were just out of stock when I ordered. Either one of the Teslas or the RX200 would work for your current topper (and there are others) but they're just different beasts.
It might be nice to have a regulated mod that you can change the power on just as something different from your current one IMO, but some people are just crazy about unreg.