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P90X and diet Weight Loss Plan? A little Extreme But need feedback?

Background: I am 17 years old,5 feet 9 inches, a male. I weigh 244 pounds. I am basically obese, but at the same time you can consider me as being much more athletic than a different person of my size (I can lift weights, at one point benching 250 pounds (from 130 to 250 in a year before I quit); run fast but not too much stamina, although when i jog/pace i can run 5 miles). My framework, I guess you can say that I'm big and have a lot of girth (width).

Goal: Is to get anywhere between 150 and 170 without compromising muscle, or in other words, shape the muscle that I already may have and ASAP (before summer - 3-4 months)

Diet: My plan for at least 90 days is to follow an interesting article I found (although no scholarly or endorsed if you want to call it, article still seems promising. It says an average person following this diet alone would lose approximately 20 kgs (44 pounds)) which kind of rotates meals and the nutrition a person may take in: For example,
Day 1: Protein Day
Day 2: Starch Day
Day 3: Carbohydrate Day
Day 4: Fruit Day
Day 5: Water Day
Breakfast fruit everyday except Day 5, Lunch and supper are the same and concentrate on what they require for that particular day.
For better details,
http://www.dietforum.com/N-90Days-Diet.htm

OR, I can decide to eat Smart Start Cereal with 2% milk 3-5 times a day (my friend has done the smart start breakfast and ran 6 miles a day, he lost 70 pounds in a month and a half but regained all the weight back in 2 years). My plan is to to switch to a healthy eating lifestyle even when I lose all the weight so I'm not sure if I should starve myself like him.

Exercise plan: I have a program called P90X. It's a very rigorous exercise program which lasts for 90 days and involves differentiation and changes its exercise focus everyday so one doesn't get used to it and keeps on building their body at a fast rate. I'm sure there may be skeptics but there is not a single review (that I found) in which a person tries the program and says its bad (I've tried it myself for a couple of days, and it really is intense)
This is NOT fake, http://www.youtube.com/watch?v=rXkCBYEWm8k
P90X is a very good program and a very very rigorous program as well and I plan on using that for its 90 day program. The guy in the video seems to a on a similar note as me when he started, but I weigh approximately 20 pounds more than him

Also, I plan on running 1-2 mile(s) along with the program anywhere between 7-13 minutes per mile depending on whether I jog or run.

1 pound=3500 calories
My plan is to eat between 1200-1500 calories MAX everyday and when working out everyday, I expect to burn 4000 calories a day (includes calories burned without exercise, like digesting or sleeping). So my calorie deficit should be 2500 calories everyday, so in 90 days or 3 months time I should be around 170-175 pounds.

Here are some of the websites I used:
http://www.dietforum.com/N-90Days-Diet.htm

http://www.youtube.com/watch?v=rXkCBYEWm8k

http://www.caloriesperhour.com/index_loss.php

http://calorieneedscalculator.com/index.html

http://www.beachbody.com/product/fitness_programs/p90x.do?code=P90XDOTCOM

Feedback is greatly appreciated! This is very important for me! Thanks a lot in advance, and I hope to get some good feedback.
=)
I forgot to add along with the diet.

I plan on drinking a whole lot of water. Approximately 2-3 liters a day

Also, I'm thinking about taking V8 equal to 3 servings of vegetables
And, as a natural cleanser, fresh pineapple and cilantro juice from a blender

Thanks!