Nikkor 35mm or 50mm on a D90?

I'm facing in a huge dilemma right now. I'm planning to buy my first prime lens, but I can't decide which one I should choose, between:

AF-S Nikkor 35mm f1.8G DX and
AF-S Nikkor 50mm f1.8G

I'm using a Nikon D90, and I'm planning to do portraits but i want to slip in a bit of full body shots.

I felt safe with the 35mm as my first choice, but it seems that no one's selling it in the location where I'm buying from. So I was thinking maybe I'll go for 50mm, but I fear that it may be too tight depending on my setting since I'm using a crop sensor. And this confuses me.

When using 50mm on a DX, How far do I have to go make a full body shot fit? Assuming the subject is, say, 5'5" - 6 ft tall? Does the 50mm become 85mm? I have a DX kit lens 18-105, so should I test it on 50mm or 85mm? I can't try the actual lens personally, because there are no dslr/lens stores in my location, and my uncle from UAE will be the one to buy it for me.

I accept other better recommendations, as long as its as affordable. Your help will be very much appreciated. And sorry if my english isn't perfect.

I think your huge delema is that you are reading too much into what a prime lens can do.

The 50 mm is a perfect lens for shooting portraits with your D90, but the 35 mm is sort of a boring lens.

Just tape your cameras 18-55 mm lens at 35 mm and try shooting with it for a few days, and I think you will know what I mean.

Lenses do NOT "become" a different focal length They are exactly what the say they are.

Only the angle of view changes when you place them on a cropped sensor or full frame cameras

If your actual goal is to shoot portraits and full frame "fashion", then the lens you need is the Nikkor AF-S 24-70 mm f/2.8 lens You will have to save your pennies a while longer for that lens. Until then, use your 18-55 mm and hone your skills shooting portraits.

Okay I shoot a D300s, and I own a 50mm. There's def a difference with the crop factor of course because the 50mm is an FX lens, and I shoot DX.
If you plan on ever moving up to an FX format - just go with the 50mm and you'll have to back yourself up to get body shots. But if you don't plan on it, I would suggest a 35mm and try to buy from somewhere else. Both are great lenses though; you'll be happy with either one you choose!