Beautiful. What are the core and accent woods in the three basses?
 
(They are with UPS in Sydney - awaiting customs clearance - should be delivered tomorrow.)

MKMB4: Mahogany body, Maple accents
KLB5: Mahogany body, Maple accent
XLB5: Ash body, Purpleheart accent, Maple pinstripe
 
You'll probably wind up liking the Excel most - it's the most unlike your other basses. You should notice a marked difference in tone.