Pre Amp for $400 ??

Here ya go !
https://www.audiogon.com/listings/solid-state-classe-model-thirty-preamplifier-black-with-phono-2016...

Bryston 0.5 B is another preamp I will vouch for.

Coincidentally upon looking there happens to be a SUMO that is available https://www.audiogon.com/listings/solid-state-sumo-athena-0620-preamplifier-2016-04-11-preamplifiers...

Thanks - I should add that:

1. I don’t need a phono stage,

2. But I do want a remote - and one that can switch sources, not just change the volume

A true audiophile product with remote @ $400 is pretty tough... The Sumo & McCormack are both nice sounding pieces.... the Low end Classe models actually do have remotes available and $400 does happened on occasion for a CP 35 or lower, you may find a B&K with Remote.  At $600 to $800 you'll start finding more options with remote.... other than that, they'll be unproven,  but there are a few decent looking Chinese pieces on Fleabay.

Did you have a SF Line-1? Did you get things figured out on that and are you looking for a $400 preamp to replace that or for another system?