Ah, my first cartridge was a Benz Glider L2, and I remember well that 1st upgrade decision! Back before I took the "blow it all" budget mentality with cartridges

I auditioned the Ortofon Kontrapunkt "a" (now Cadenza Red, which is even better) and liked it better than the Glider, but that Ortofon model will not have the warmth you seek. I ended up with a Kontrapunkt "c" (now Cadenza Bronze), which has that warmth and would be an amazing upgrade to you Glider - but it's outside your stated budget. Later I picked up a Benz Wood M2 and Ref 3 for fun (note these are all 1 series out of date) - there's definitely a consistent Benz "house sound" across the 3 models, which is nice and I really do like it, but felt that overall performance scaled better with the Ortofons in that price range.
Shelters have a great tone and touch of warmth, but I've only heard/own their 2 top models (Accord, Harmony) - still, I'm sufficiently impressed that I'd be looking hard at the various Shelter models if I were you (I like them better than Ortofons). I like Koetsu even better than Shelter, but...price.
And of course the Hanas have been getting the most press in this price range, though I've not heard one myself. Probably worth a look!