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what would be the best base coat and top coat?^^
By the way, since you're looking for new polishes, have you heard about Zoya's exchange? If you send in your old used polishes (minimum 6, maximum 200, any brand but Zoya), you can get an equal number of new bottles of Zoya. You only send a check or CC# to cover $3 shipping per bottle you will get. For example, I sent in in 6 old bottles of OPI that I wasn't using anymore plus a money order for $18 and I got 6 bottles of Zoya. I got Zara, Trixie, Raven, Suvi, Kotori, and Freja. The exchange offer ends 2/28, so you better hurry if you're interested. Here's a link for the details and to get started:
http://www.zoya.com/exchange
I don't believe that there's one 'best brand'. Some last longer on different people.
I get the best wear out of China Glaze polishes - sometimes ridiculous wear of like 20 days without a single chip (as was the case with Blue Sparrow and Flying Dragon - probably because they had gritty glitter in the formulas)!
All that being said, if you have the right basecoat and the right top coat, you can really get almost any brand of nail polish to last a reasonable time (a week).
For a very diverse collection of colours, I'd have to recommend OPI.