. I can see that there are some viable options at the economy level that are not just toys.
There are indeed. There are also vintage full-line preamps, too, for that price. But, most of them are golden oldie
SS models from the 70's and early 80's, tho.
But, vinyl doesn't
beg for tubes quite as sincerely as digital does (or at least, that's what I've found

).
I'd take the Bellari off your list of contenders...I think the B & O cartridge have fairly puny voltage outputs (under 2.5mv) and the Bellari is a Pro Audio/DJ preamp now selling to the audiophile community. Most DJ cartridges are 5 mv+ ....and thus, the Bellari, only has about 30db gain stage. You'll
likely need closer to 40 db (room, amp, preamp gain dependent and speaker efficiency all play it's part).
But, the Bellari is
likely not gonna' swing it with your current B & O cartridge (tho it's unusual for the price as it includes a rumble filter - a pretty useful thing to have with many vinyl systems)
John