If you can stretch your budget a bit a TAD Signature 150 would be a great choice. I recently acquired a N.E.W. P3 (made by Cary) for $525 and I'm very happy with it. With quality NOS tubes it equals the VTL 2.5 preamp that I had. AES also made my Cary has some nice preamps. An older Counterpoint SA-2000 is another alternative and well within your budget.
I suggest avoiding Audible Illusions. I had a Modulus 3 years back and it was hard on tubes. You're limited to specific tubes that can handle the abuse. I've read the rebuilt Dynaco PAS preamps using Van Alstine mods sound nice too for the money although I have not personally heard one. Whatever tube preamp you get you'll need to factor in additional cost or quality NOS tubes. They do make a difference. However, cost can add up quickly for good tubes. I tend to limit my preamp choices to preamps that use (6) or less tubes, preferably (4) to limit money needed for tubes.
Best wishes
I suggest avoiding Audible Illusions. I had a Modulus 3 years back and it was hard on tubes. You're limited to specific tubes that can handle the abuse. I've read the rebuilt Dynaco PAS preamps using Van Alstine mods sound nice too for the money although I have not personally heard one. Whatever tube preamp you get you'll need to factor in additional cost or quality NOS tubes. They do make a difference. However, cost can add up quickly for good tubes. I tend to limit my preamp choices to preamps that use (6) or less tubes, preferably (4) to limit money needed for tubes.
Best wishes