I know it looks unreal/fake, but how can I take photos like this example? It's not a very long exposure because there are no trails. Also Betelgeuse looks noticeably red and it's cool. You can also recognize many known stars easily.
by Paul Cezanne
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To make big stars like this, consider using a softening filter. It will help to spread the energy over a larger area and this the star colors will show up better.
Consider using a higher ISO, but that will create more noise in the image, and is likely to catch much more of a sky glow if you happen to be near a city or town.
Best shoot in raw and try out a large number of ISOs for the shot, and then see how much detail and noise you could recover using Photoshop/Lightroom/Aperture/Other Software. You'll have to experiment a fair bit with this.
What may work for you if your're trying to avoid a sky glow is to use a graduated ND filter (like a Cokin) , but with the darker side towards the ground. It might mess with your composition and its resulting exposure though. I haven't really tried that, so it may work or it may not.
Finally, if you want to use low ISOs and long exposure times, consider getting a tracking mount for your camera. The mount moves the camera at the same rate as the rotation of the earth, thus avoiding the smears you get with long exposure. This is a somewhat expensive solution though.
Also, let us know what works best for you in the end. :-)