If you're in communication with them about a rebooking I'd take the opportunity to tell them exactly why you won't be coming back. Venues need to offer much better support to entertainers than you received.
They do tend to be in the 'look at me, aren't I fabulous' category. Bass players in that category tend to be the worst of the lot but are thankfully few and far between.
Vitoos ISO 8 is a cracking little unit. Been using one for a few years now and no problems. Fits really well under a pedal board too being as it's so slim. As you say, shame they're no longer made,
What other instruments do you have in the band , what sort of music do you play, what sort of gigs do you do? Also what sort of budget do you have? These things will help people to give you objective advice.
I use an Ampeg Scrambler and a recently acquired EHX Battalion (both standard pedal size). The Scrambler gives a nice bit of low gain breakup (but will do much more) and the Battalion gives a much more aggressive drive. Gigged it for the first time last night and got lots of positive feedback.