phono pre amp giant killer?


I'm in the market for a used phono pre amp. I'm considering the pro-ject tube box II and the clear audio nano (because of some positive reviews and the fact that I use a Clear audio Vertuoso Wood Cartridge). My question is how much do you need to spend on a used phono pre amp in order to get to the level of truly top flight performance? My budget was going to be 350 but that may change with this thread.

thanks
andy
andyth
Thanks for the input. I know my system is askew. I was going to sell everything and then decided to keep my sources. I have a peachtree decco and era 5 speakers. They are good for the price point. I listen to bluegrass, country, classical, hawiian and world music.
Andy, for bluegrass in particular I would look for a phono stage with high slew rate so that the plucks will sound right. Ask about this when you talk with designers/manufacturers.
Go for either the Phono Box 11 SE or the Dynavector 75. I have the latter currently in a system that would retail for above 30K and it is not disgracing itself.
I'll echo Stanwal on the Dynavector P75. Unbeatable for the money, both for sound quality and flexibility.