Where to go from Progasm?

I’ve had my progasm for about 4 and half months now and love it, it’s my first Aneros and after 4 years of anal play it’s gotten me to my first anal orgasms, however I crave something more. Mainly size: I want bigger. Where do I go from here? The vice isn’t much bigger so what’s left? What about a dildo? I’m just brainstorming here, so where should I go?