The impedance matches between preamp and amp and between dac and preamp are essential. The ratio of the successor input impedance to the predecessor output imp. should be as high as possible. As a rule of thumb, 10 is the minimum, 100 is preferrable and 1000 is ideal to maintain flatter response curve particularily on the low frequencies. Among the Class A recommended SS preamp by Stereophile, your better choices will be (1) Benchmark LA4 ($2500) and (2) Rotel Mich P5 ($4300). In particular, LA4 has high input imp. as 80k ohm and low output imp. as 30 ohm (SE) / 60 ohm (balanced). Those specs will render high imp. ratios close to or exceed 1000 that are considered ideal match. The Rotel P5, on the other ahand, will also match with your dac and amp well if you use balanced connections.
No matter what you have decide to purchase, it is suggested that you list both input / output impedances of the preamp and calculate the imp. ratios to justify if it matches well with your current dac / amp. Then look at the reviews from the reviewers you trust to find out whether non-measurable listening experience is great. I was sort of hesitated to recommend the crazy low-cost preamps Topping Pre90 because of the mixed reviews from the reviewers I trust.