#1
I would just like to get my technique to a level where I can play most of the songs, nothing fast, without problems, so I was wondering if you have any songs for acoustic guitar (I'd like them to sound good) which would help in a specific way to develop technique...

I hope you know what I mean.

And yeah, thanks!
"The end result - the music - is all that counts"
#2
You might try some classical:

Bach's Bouree in E minor is good. "It is Bach and it rocks, it's a rock block of Bach!"

If you can nail that you'll be set. It's relatively easy.

Or a recent favorite of mine: On the Road Again by Willie Nelson.

Might want to slam a beer first.
"Virtually no one who is taught Relativity continues to read the Bible."

#3
Basically anything (acoustic) by Al Di Meola will help with single note stuff.
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#4
Anji - Davy Graham.

It's used to be a rite of passage for the folks guitarist. Not sure if it's still considered that, but it's a beautiful song.