Are you looking for a full range speaker or a monitor to replace the Martin-Logans?
You are probably used to a very quick and detailed speaker by now. You might try Focal JM labs speakers for full range. Monitorwise, you might try Sequerra MET 7 mk VI ...a very musical and natural sounding monitor for not much money. Also ACI sapphire XL are a real insiders audio secret. Both would go nicely with your tube gear.
Complement the monitors with a nice ACI force XL and you'll be very happy.
