hi,
I am new to RCIndia and done some homework on how to build a quad rotor through this site.
outset, apologies if i am posting it in a wrong zone. . .

i am planning to make a quad rotor on a budget of around 25k, however, i wish to upgrade it once I get good experience of flying it. I dont want to use a DIY or ready to fly model as my first quad as I want to learn while i try to make one.
following is the configuration I intent to use for my first quad.

Sr   entity           particular                                          qty
1   Frame   Q450 Quadcopter Frame                   1
2   Propeller   10x4.5" Props Blue (4pcs Set)                   2
3   Motors   DYS 1000kv Brushless Outrunner Motor   4
4   FC           KK2.1 LCD Multirotor Board                   1
5   Radio           9Ch Radio with LCD                           1
6   ESC           DYS 30A ESC                                   4
7   Battery   Zippy Compact 2700mah 3s 25C LiPo   1
8   Voltage LED Display with Buzzer                           1

i wish to upgrade the FC to a DJI Naza or Ardupilot after about 30 hrs of flying experience with this one.
now my questions are,

1. I've selected a Lipo 2700mah 3s 25c. . . . . . is it ok for the config?
2. I noticed that Flysky is an OEM and its preferred over a turnigy for Tx Rx. . . . is it right?
3. i've selected DYS make BLDC, is it vfm as i want to make this quad at a stipulated budget of 25K?
and the last one,
4. I tried to calculate the flight time through some online quad rotor calculators for the above mentioned configuration, it turns out to be 7 min. is it ok?

Lastly, countless thanks to Mr. Anwar. . . . RC India has provided all sort of help through all the topics that i could zero in my configuration.

looking forward to some replies. .
BR,
Prashant