Well, if you already own a high-end light meter and some PW triggers, I think you'd be paying for stuff you already own in the form of triggering stuff, and the B1 Ai is about $2100, plus needs a $400 module to make it functional, if I understand it. I'll be honest: I consider Profoto to be very overpriced by most metrics, and when the B1 TTL battery-powered monolight was introduced, I ridiculed the idea of a TTL monolight. When I found out it was priced at over two thousand dollars, I thought it was utterly insane, and aimed at noobs who have no idea of how to shoot flash.
For a person with a "growing" home studio, the $3,000, three-outlet power supply, without ANY flash heads! is just...flushing good money right down the toilet. No offense intended, but Profoto's "TTL monolight" idea is...well...hard to say it politely. But look around at the number of other TTL battery-powered monolights on the market. Their pack-and-head and their TTL monolight items are...extremely expensive, and there are multiple alternatives that cost wayyyyy less and which will work just fine.
Here's the deal: If you want to buy into a system, buy into one that you can afford, and one that has affordable everything. Buy Speedotron or DynaLite or Elinchrom, or even buy Einstein if you're drawn to the allure of short flash duration and monolights. Profoto pushes flash duration very hard, but if you're buying a pack-and-head system, for God's sakes, buy a pack that has FOUR outlets, or SIX...and if you're paying $3,000 for a three-outlet power supply, you are being regally reamed. Three lights, and $1,000 just for the "right" to plug in EACH, individual flash head?
OMG...only from Profoto.
Seriously...look at something priced fairly...look at Dyna, look at Speedo, look at Elinchrom. I personally know of zero studio/pro shooters who have a TTL monolight. TTL controlled monolight with battery pack? This is a brand-new, made-up product category, designed to appeal to people who are obviously NOT professional shooters, and who have little idea that they will typically set up the flash and modifier, calculate the desired ratio of flash to ambient, and then set the needed power, set the f/stop, and then shoot at one, single,exact flash level in manual flash power mode, so the frames are consistent and perfect, as calculated by taste/experience/desired ambi-to-flash ratio.
But the idea of a TTL monolight that costs $2,095 and needs a $400 module PER FLASH HEAD...that makes a GREAT YouTube commercial video!
You say you're open to other opinions: PASS on Profoto lights, entirely. Spare yourself the a**-reaming, and be able to outfit an entire studio with what you REALLY will need, which is stands, boom stands,clamps,foam boards, a set of proper Scrim-Jim type scrims/panels,diffusing fabrics, reflecting fabrics, softboxes, umbrellas, background support equipment, mylar diffusers, clamshell reflectors, grid sets (multiple!), 7, 11,5 and 20-inch reflectors, background paper, fabric throws, posing stools, perspex and plexiglas, and a few dozen other sundries.
You are being sold a bill of high-tech, uneccessary stuff, and the bill is going to kill your "growing home studio" in its infancy. A three-outlet pack for three thousand dollars?