I'd actually NOT recommend the 510. It works great, but the battery life is atrocious and it can be a pain filling it.
My girlfriend got a ego-t kit with two of everything and a bottle of juice for $100 from the local shop and she said it was the best money shes ever spent.
I upgraded my 510 first by getting an ego-T 1100mah battery (the threading on the batteries and atomizers are the same for the egos and 510) That battery is intense. It last like two days of steady chain smoking with a lot less sag.
Then I got an ego-t atomoizer and tip.
http://www.shop.wordupecig.com/Joye-eGo ... er-Kit.htm
As for liquids....way to many options... try 18mg of nicotine.... it sucks you don't have a local shop.... mine has a smoking table with two hundred flavors to try out