basic passive preamp

You want 10kohm log cheap and good quality, there are many on ebay under $100?
The pick for me though is the 10kohm log Schiit Sys. $49 and if you don’t like it you can send it back.
And if you need more inputs there are many rca input switch boxes on ebay cheap.

Cheers George

http://schiit.com/products/sys

I would look into Tortuga passive preamp. 

http://www.tortugaaudio.com

What is your amplifier and source? System matching is very important. TVC would be the way to go. What is your budget?

i used to have a luminous audio axiom--very inexpensive and very good--you can get one with three inputs

McCormack Micro Line Drive is the champion!.
It can be used in active mode as well with unity gain or up to +6db.