First off, that's some mighty pretty shiny! IMO, while art bars are great to look at, they should only comprise a small portion of your stack. They are motivation to keep stacking and help you enjoy your silver, but carry the potential for losses (based on their higher premiums and smaller pool of potential buyers).
I totally agree they are more to look at and should always be purchased with this in mind. They will increase over the long term as older bars and rounds sell with quite high premiums. Certain pamp bars increase hugely in value. If its stacking silver I always go for the lowest price bullion around. Like you say its always good to have something nice in your collection.