buying a helmet. budget 2k. motoX preferred

hey guys, i need a new helmet. budget is 2.2k or lower.

1. should i buy a motocross helmet ? or regular one? i ride in city only with speeds less than 50kph all the time.
i prefer motocross for looks

2. i'm planning to buy this
Vega Helmet - Off Road Graphic Monster - Black Base with Green Graphics - With 1 Pair of Ear Pads - Buy Biker Gear & Accessories Online| Snapdeal.com

but i have a few doubts. can i fit external visor in that vega helmet? to avoid water [during rain] and dirt on face ? like this one?
GLIDERS MC-1 [Motocross Helmet] 20% DISCOUNT + FREE SHIPPING!!! | eBay

3. can i trust snapdeal ? i never bought anything from them.

any other sites selling these type of helmets?