VAC is always a good bet here, without treading into maple syrup territory. 4K won't get you anything new, but used older models can be had in this range.
Call Don Sachs. He can do his "all in" pre for well under your budget. I didn't know a pre could make such a difference until I plugged his into my system.
Dennis Had makes some great sounding preamps the Inspire LP-3.1 is his newest,I think.He sells them on Ebay. You can use 6SN7 or 6SL7and it is also reasonably priced. A tube rollers dream if you like to do so.
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