Andrew, no good reason to pass up the Aurora disc with fine performances and sound at a bargain price which Eric suggested for the Prokofiev, and likewise for the Mendelssohn .

Since you enjoyed those string quartets, if you don't have them I'd recommend even more strongly the two discs containing the Debussy, Ravel, Borodin, Dvorak and Tchaikovsky quartets shown in Mike Drew's post above.

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Enjoy the music, not the equipment.