Tomas - I highly recommend looking into passive preamps, which will cost you probably half of your allotted price but far exceed active preamps at any reasonable price. The B&K amp you have (I have an EX-442 in my second system, which is a good piece of equipment) has the following specs that are important in this decision: 1.4 volt input sensitivity (which is terrific) and 33.2k ohm input impedance, which is on the lower end, so you need to be careful about which passive you buy.
At this point, you are probably throwing up your hands at having to look at these specs, but trust me, looking into this area will allow you to easily buy a unit in your budget which slaughters any preamp under $1k. I mean slaughters. There's no comparison in this price range. Good luck.
At this point, you are probably throwing up your hands at having to look at these specs, but trust me, looking into this area will allow you to easily buy a unit in your budget which slaughters any preamp under $1k. I mean slaughters. There's no comparison in this price range. Good luck.