Would this be a good lens for me to purchase? - 1

I have had a Nikon D3100 for about 2-3 years now. I got it as my first DSLR camera and I learned a lot about how to take photos with it! I got it with a 18-200mm lens, which is great. But I'd like to get a more portable lens for when I'm just hanging out with my friends or while I'm on the go. I was thinking the 50mm f/1.8 nikkor lens would be good, since it has such a small f value (the lens I have right now will only go as small as f/5.6). I was wondering if this would be a good lens for me to get? It's only 140$ so that's not too pricy.
Let me know what you think, thanks.

FANTASTIC

I'd recommend this site, I think he's got a good view of things.

He really likes the Nikon 35 mm lens much for the reasons you want. Your call between a 35 mm and a 50 mm depending what type of photography you take.

Be sure the one you get is the Nikon 50mm f/1.8G AF-S lens, or else it won't autofocus with your D3100. The advantage of the smaller size would be wiped out by the time spent focusing on your subjects.
http://www.amazon.com/...001S2PPT0/

You can also find several of them on Ebay, as well.
http://www.ebay.com/....8g&_sop=1

It'll be pin sharp, versatile in all light and great for maximum creativity. Lovely lens apart from the fact that your legs become the zoom function.