Sublime Text 2 shorcut line substitution
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Excuse me for the non-informative title. Just can't shortly describe what I want within one question.

Okay, let's say we have two lines in our text file. The cursor is somewhere in the 1st line (the example shows cursor position):

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What I want is to substitute the first line with an empty line or with another line and cursor should be at the start of this empty line.  

I tried Ctrl+L and type the "new line". But Ctrl+L expands selection to the line + \n and that causes this result (the example shows cursor position):

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If the cursor is at the begining of the line, Ctrl+KK works perfect. But how can do the same when the cursor is not at the begining (without pressing Enter, arrows and using mouse)?