Solar winds should help. You don't have to blow your budget on telefunkens. I really like golden dragon tubes as well as svetlana, don't rule out any old stock 6922s. Sovtek are crap. Switching to the aragon or classe will still leave you with a softer sound. If you need more bite in the highs after new interconnects and tubes, it's time for new speakers.
Good tube sites: tubesandmore.com, thetubestore.com, tubeworld.com (pricey), tubeman.com or jeffssoundvalues.com
Good tube sites: tubesandmore.com, thetubestore.com, tubeworld.com (pricey), tubeman.com or jeffssoundvalues.com