Upgrading preamp. Best for under $1K

Tubes 4 Hifi has several excellent fully assembled tube preamps within budget: http://www.tubes4hifi.com/pre11.htm

The Schiit Freya + is super solid for that price range. On Friday I will be receiving the Scihiit Kara to test run. It will be used in place of a Wyred 4 Sound Pre with the second level upgrade. Will be doing my own thunder dome. Whichever unit performs, the other goes. 
 

One thing to keep in mind regarding the Schiit preamps is the input impedance is about 10k ohms. Be cautious of impedance mismatches. 

+1 for the LTA unit if you can add a phono stage later on. Went from an LTA MZ2 as a line preamp to the Microzotl pre because I was so impressed. Imaging, dynamics, soundstage, all awesome for the money and as mentioned, David Berning designs are low impact on overall tube life.

Thanks for the responses! It seems tubes is the way to go for preamp but will it match well with the B&K amp?