Need budget, used tube preamp to go with Bel Canto

Hi, Gang!

I am moving up to separates from a Unison Unico integrated amp. I want to see what my Ohm Walsh 100-S3 speakers will sound like with more power. I picked up a Bel Canto S300 (150 W into 8 ohms) here on Audiogon. Now I need a preamp. I'm pretty much sold on getting a tube preamp, but my budget is only $700 max this time. So a used preamp is obviously the way to go. I don't need a phono stage because I have an outboard unit (a Bottlehead Seduction that I built.)

What suggestions do you have for a relatively inexpensive used tube preamp that will mate well with the S300?

And what do you think of using a Peachtree Decco as a preamp? My CD player (Music Hall CD 25.2) has digital out, so I could use the digital in on the Decco for that, and use the analog inputs for my phono stage and tuner.

Thanks in advance for your wisdom!