New Canon Camera

[digo]

Hello guys..
I have buyied a new camera its the Canon PowerShot A 510.. Its a great one.. Just if someone that have this camera or knows what is the best quelity to takePictures..
I have this options, In each size i have three options: Normal\Fine\Superfine.
This are the sizes i can choose: 2058x1536\ 1600X1200\ 1024x768 \ 640x480..

I have trying And i think the 1600x1200 or the 1024x768 in fine are the best ones.. What you guys reccomend ?
Anyone also knows how to take the best pics at night?