AO & AD Help

As I'm moving out from early game (I can auto GB10, DB10 and beat TOA Normal) I need to better my offense and defense both in arena and guild wars. Currently, my AD is Vero(L), Kumar, Ritesh and Bella and I would like to change that, also I would like a AO speed comp with tiana in it. Since my birthday is coming up I've saved over a 100 scrolls and I'm expecting to get some sort of AOE nuker. These are my current monsters...any advice or suggestions would be highly appreciated, thanks! Also, I would like some help with next 6* well after baretta because that's my next priority. http://imgur.com/LXw68UX http://imgur.com/CJTZGBY