Spica TC-50 or Vandersteen 1b/1c or ?

Speaker dilema: do I stick with the Spica (which I got at a very good price) or do I go up in size to the Vandersteen. I really like the presentation of the Spica's but even before them I had been using monitors for a long time and I now desire a fuller range sound ($300-500). I'm skeptical about adding a sub and I remember hearing the Vandy 2c years ago on a tube system and being blown away by the sound - the performers and soundspace were palpable. I don't have room for the 2c series but thought the 1b/c might be a good compromise. My system is currnetly a CAL Sigma DAC, NAD amp, Kimber and Audioquest lines. I am working on replacing the NAD with an old Fisher 400 tube reciever (about 25 wpc). Any opinions and advice will be appreciated.
Thanks.