Want to buy a decent smartphone

Is Nokia E6 a better option for me in todays android filled world??

Please suggest any other option.
I want
3G
GPS
WIFI
and
Video Calling and qwerty if possible.

Whether it is Symbian (Nokia), Android, Apple OS, or whatever, why should the OS really concern you as long as the phone works as desired.

The OS matters only in case of speed and other applications available. For the functions that you mentioned, OS will not matter.

Choose the phone that you like (size, weight, feel, asthetics, etc.) and which is in your budget.

I would rather suggest you to buy a decent phone with smart features from Nokia. Nokia is trying to make the best feed customer base who gives positive feedback of any handset used of Nokia. So Nokia recently launched some amazing handsets, i think you can get the one decent handset from here. Asha 200 gives internet, games and apps, dual sim utility and also the best music on phone.
Asha 200 features QWERTY keypad and also fulfills every need of a smartphone, but the price tag is very lower and much affordable than any other phone with probable similar features.
Nokia concerns much about its customers and its handsets.

You have mentioned just 5 features that you need but i would like to suggest you double features and the price would be as lower as you expect. Just check out the Nokia Asha 303. you can see the around all the reviews at various discussions sites and youtube, apart from it i would also suggest you to read the reviews at various online retail sites like ebay. I am sure you will love it and get one. It has all the top 5 features that you have mentioned above and also has 1 GHz processor, 32 Gb memory, 4 million Apps and games, 3 million free songs to download free. Internet is also very fast and a total multi-tasking phone.