The Dynaudio 1.3se used drivers that are unique to the 1.3se and are not available in any other speaker: both bass/mid and tweeter feature neodymium magnets and are considerably more powerful (and expensive) than conventional ferrite magnets.
Personally, I don't think you can do any 'better' for the money than the 1.3se: I think that they are a rare balance between phase coherence, accuracy, transparency and musicality without being overly analytical. The only thing lacking with them, in my opinion, is that they don't do super deep bass; however, they do go to 37hz in my room without any booming or smearing. Of course, since every loudspeaker seems to have its own unique personality, you may prefer another...I would buy the silverline, listen to both, and sell the lesser speaker irrespective of price.
Lastly, if you do keep the 1.3se's, consider changing out the synthetic stuffing for natural wool. I experimented with this and found a slight but worthwhile improvement in the bass and midbass with the wool. Considerig the cost (around $20) it was a very economical upgrade!