If you can connect your monitor directly to a DVI port (no VGA converter) then yes the image should be better. VGA is still analog and you need to tune the monitor position and size and all that to get clear text. The DVI port is digital signal to the monitor and you get a perfectly aligned and clear picture all the time. (There may be some other issues if we are talking about a television and not a computer omnitor though).
Dunno tha answer to the second Q.