If it was my money and I had your size, I'd go with the
X30 base model and mod it with the VacuVin, (but only after I had a few weeks getting used to the stock
BM). My rationale is two-fold...the base model is much less expensive and the mod will only set you back around $20, and (I'm only guessing here) that the VV mod creates much more additional pressure than the extreme models, (I say this cuz The VV can literally create enough pressure that you feel your d!ck will explode, while I'm certain there are safe-guards in place on the Extreme models)
Just my $0.02