Upgrade from Silverline 11


I have Silverline 11's, which I like. I would like to upgrade, however. I live in an area without great audiophile resources therefore I'm buying without hearing. Any suggestions for upgrading?? Thanks...
earthquake
What do you want that the Silverline 11's are not giving you now?
(Better bass, more refined treble, better imaging, bigger soundstage, etc....)

Other items that would be good to know:
Your budget;
Your amplifier; (i.e. make, model, power, etc.)
Your room size;
Your tastes in music; (i.e. rock, classical, jazz, polka, death metal, etc....)

This additional information will allow us to give you a better list of suggestions.
I have:
NAD 320bee(50wpc) ,10x15 room, rock-blues-jazz;
solid bass, detailed high, open sound stage. $1500-17 aprox..

As I said I like my used Silverlines I wonder if I can refine or move up. Thank you.
I would check out the Merlin TSM-mm. Pre -owned they would be within your budget. I'm using a pair with my NAD 325BEE (see my system) and it is outstanding.

Cheers,

Scott