You seem pretty serious, so I would suggest your best move would be to spend a several hundred dollars on experience, getting to a HiFi show. Irreplaceable knowledge and insight gained at shows. You'll likely end up with too many ideas on how to build your rig, but you'll almost assuredly find a killer change which will make the time and money to attend very worthwhile.
Barring that, I agree that a speaker change would be efficacious.
Barring that, I agree that a speaker change would be efficacious.