What's wrong with the standard size Nautilus (larger tank with more liquid capacity)? Otherwise its the same tank as the mini.
IMHO, the Aspire Nautilus (standard or mini) is the best clearomizer tank on the market.
You should be able to put any drip tip on the Nautilus. Places I can recommend for a variety of drip tips are
RTD Vapor and
Drip Tip Designz.