IPU CET

See, if you are a Delhi resident, then you can easily get the college at this rank but if you are of outside Delhi, then this will create problem for you.

You can easily get any of the colleges of your choice with this rank without having any problem. Plus, you are a resident of Delhi.
This will act as a booster for you to get a good college.

GGSIPU 2018 College Predictor
Use your GGSIPU 2018 rank to see where you can get admission at the link provided below:
See the courses, colleges & rounds you may crack
The result is based on admissions data of GGSIPU 2017
Get resources & insights on colleges & courses
https://www.shiksha.com/b-tech/resources/ggsipu-college-predictor.

Yes, you have high chances to get admission.

Ofcourse B. Tech from NIEC,as it has more value and will give you a bunch of opportunities for bright career.

GGSIPU 2018 College Predictor
Use your GGSIPU 2018 rank to see where you can get admission at the link provided below:
See the courses, colleges & rounds you may crack
The result is based on admissions data of GGSIPU 2017
Get resources, insights on colleges & courses:
https://www.shiksha.com/b-tech/resources/ggsipu-college-predictor

You MAY get an affiliated college in spot counselling round. But the chances are really less. You can get admission through management quota or you can try the next year. You may also apply to provate colleges to save time.

Quite less, I would say. In round 3, the rank ends at 1500 approximately. Try your luck in spot round where there is still a chance.