If your 4311s are working fine, don't need the woofer surrounds replaced and you're enjoying them, I'd say don't spend money you don't have to spend. If you wish to try something else, I'd say stick with high sensitivity speakers like you already have: pick up a pair of JBL L300s, a nice pair of Tannoys (System 15 DMT, for e.g.) or a pair of Altec 604-8G.
If you like the overall sound of your JBLs, I don't think the other speakers you mention will offer the dynamics and excitement that you're used to.
Happy listening,
Joel.
If you like the overall sound of your JBLs, I don't think the other speakers you mention will offer the dynamics and excitement that you're used to.
Happy listening,
Joel.