For those having problems printing good covers due to margins, etc. try using UndercoverXP. It is a free program (donations requested, but not required) that is very easy to use and customize to almost any kind of DVD, CD or Blu-Ray case... including slim cases.
I have always used glossy photo paper to print covers because they look beautiful. I think it is worth the extra cost of paper and ink to print a photo quality cover.
Hope this helps.
“When all Americans are treated as equal, no matter who they are or whom they love, we are all more free.” -Pres. Obama
"A great democracy does not make it harder to vote than to buy an assault weapon." -Pres. Clinton