I've never heard the Callistos or TSM's, but I've been extremely happy with my upgrade from Trentes to Offrandes. I agree with Duanegoosen that moving up in the Reynaud line may make sense, although I've never had his experience of the Offrandes as being even remotely piercing. I'm driving mine with a VAC Avatar Super integrated amp. I find them to portray a great sense of presence, air, and timbral nuance, while still sounding pleasingly warm. I love them for jazz and chamber music, mostly what I listen to.
Someone had a pair of last generation Offrandes listed at a good price recently. I don't know if they're still available.
Someone had a pair of last generation Offrandes listed at a good price recently. I don't know if they're still available.