If it were me (and since you're asking)
No. 1= KAYFUN STYLE TANK. As low as $15 from fasttech (if you want to wait for it to be shipped; FYI the Kayfun style tanks I ordered were on January 11, 2014 and were not actually shipped until Feb. 18, 2014), to $24 or so for a Rocket atomizer off of ebay (less than $13 from Fasttech, but then there's the wait). If you cannot wait (and I didn't) I would buy an HCigar version Kayfun from a reputable seller off of Ebay (I paid $36 off of an Ebay buy it now after waiting 4 weeks for fasttech). Honestly, the Kayfun is the best tank I have tried and I have tried a whole bunch. You already have wicks and coil and experience with an RDA. Kayfun is very easy to build, and should be no problem for someone like you who already has experience.
No. 2: MECHANICAL MOD, you already have an ego style and a vv/vw set up. What you do not have is a mech mod, and I have moved into that after using Vamos/lavatubes for a long time. Buying another vv/vw will not really do anything other than what you already have. If you don't already have a mechanical, get one. Buy a cheap one just to see if you like it (and you can spend the $$ on a high end mechanical later if you like it). You can also buy a kick clone from fasttech for under $9, (And the reason I went to mech mods in the first place was my vamo blew its pcb board) which would transform the mech into VW. If you find you don't like it, worst comes to worst it would just be another VV/VW device . A mech from fasttech is $10 for a aluminum sentinel clone. Just go there to find what you like in terms of style or look through the stateside vendors. I bought a mechanical with the kick to see what it was all about and ended up not using the kick and going straight mechanical. VV/VW hold no appeal for me now whatsoever.