Preamp recommendation for Bryston 4B-NRB

Hi - looking for some preamplifier recommendations for my main system. I unsure at this point what speakers they will be driving as I have several here. They all are somewhat inefficient and include (in no particular order of preference) Dahlquist DQ-10, Alon model V, Magnepan 1.4, Magnepan 20 (those these are likely more valuable than I can justify keeping for my personal use). A couple of possibilities that are more efficient and would require less power include B&W 603.3, A/D/S 1090, and ACI Shaphire III. Regardless, some would do better with a bit more juice. My amplifier choices are a Bryston 4B-NRB and possibly an Aragon 4004 Mk II (though less likely here as this amp has a barely audible hum - in the case, not in the signal - which I have been told my indicate a tranformer that has developed an issue)

What I am looking for in a preamp is a good quality that still has some features. I realize most audiophile units just allow you input selection and volume control and while I do not want tons of "bells and whistles" I would like basic tone control (and possibly the option to defeat it) contour option, and balance control. I will mainly be playing CDs but LOVE vinyl so a very good phono section would be a plus, though I could opt for an external phono preamp if this is better. Some local freind have recommended the old NAD 1020 at a budget price. I can justify a budget of about $500 for this addition. Any suggestions? Thanks.