Hmm... Well I don't want to set you up with a bunch of articles so you have to understand each and every chapter and their history.

So, I'm going to answer a question with a question, What's your style preference? Do you prefer darker backgrounds and even darker color schemes? Or are you more on the loyal side, with clean armor and holy personas?

[b]A list of some notable Space marine chapters you might be interested in;[/b]
-Salamanders
-Blood Angels
-Legion Of the Damned
-Dark Angels
-Space Wolves
-Grey Knights

If this doesn't help, then just shoot me a PM and I'll help you to pick a space marine chapter, based on your preferences.