Mixxalot: Yep, when you're talking about a small build like this, put in a more complex source as the 'primary' generator and then something simpler as a 'secondary', so that it can both serve as an LF-thru-audio modulation source for the primary as well as a second source to mix with the primary to fatten up the signal. Interestingly, since the Titan outputs an appropriate waveform from both outputs for sync use, you could theoretically use it for both a signal source AND as a modulation component for the Plaits simultaneously. True, the Plaits doesn't have sync as such, but there are functions on it that can make use of that audio-frequency sharp-rise waveform for some interesting results. But another crazy-as-hell VCO that fits that slot and which CAN use sync is Doepfer's A-110-6, which is their full-featured TZFM VCO, and that would make for an excellent and purely analog 'primary' as well.
And yeah, this stuff costs real money. But at the same time, that money buys you the ability to step out of normal sound creation methods, which tends to be worth the cash outlay. When you start getting up into the bigger builds, also, you gradually enter into areas where prebuilt synths simply don't go...again, quite worth the money.
As for interesting cabs out there that combine solid builds, good power supplies, and decent pricing, Arturia, MakeNoise, Tiptop and Erica are putting out cabs that're killing it on all fronts, IMHO. In fact, Erica's 126 hp cabs have become a recent fave for larger builds I'm speculating about, along with the Arturia Rackbrute 6U for tandemming with their revised Microbrutes. Either are super choices, with the Erica being awesome for standalone, and the Arturia combo really kicking ass if going with a patchable + modular. Either one seems to be a good choice, it just depends on where you want to go with this craziness! And actually, Velocipede808...you might benefit from something like the latter; have a look at the Minibrute 2S, then consider a Rackbrute 6U on top of that as a unitized and portable setup. It's cost-effective (the 2S is only $649 street!) and seems like it might be where you're aiming for.