Good stuff.
You could always get the 2hp Bell.
I do find both my Pluck and Bell rather hard to tune with the small knobs.
One thing you can do with the Bell is to throw its some modulation to the Model input and make a nice Ambient background texture into a delay and reverb.
Enjoy your spare HP, don't rush to fill every last space, this is not like filling sticker books. Resist the urge to 'complete' your rack, its never complete so just relax.