About seven years ago I migrated from a Sinar C to an Arca-Swiss F-line. The Sinar C has the rear standard of the top ofthe line P camera (now the P2 and the front standard ofthe F cameras. I do the same kind of work you describe that you'll be doing and i needed a camera that was more portable.
To start off with: the Sinar F cameras are nowhere near the camera the Sinar P, X and C cameras are, not even in the same league IMHO, but many architectural photographers I know use them with varying degrees of happiness. I don't know of any studio based photographer who is happy with the Sinar f cameras for studio shooting, especially for product work: the camera really isn't designed for the long haul of product photography.
The weakest aspects of the F cameras are (in my experience) the rise mechanism, the combination of shift, swing and tilt mechanisms, the unnecessarily tall tripod block, and the need the need to refocus after using rise or fall on the front or rear standards, and it is bulky to take out into the field without completely disassembling it Also at some point in the next few years you'll be considering getting a digital back and it really will not physically support support one of those.
Strong points of the Sinar F cameras: it gets you into the Sinar system; it is a yaw free design; the depth of field calculator; lots of used accessories in the USA market.
If you really want a Sinar F series camera get an F2, the F1 or the older models of the F won't be worth your aggravation. I say this because I tried. even better would be a Sinar C or C2 if you can find one or the Sinar X.
Several people here have already mentioned the Arca Swiss F cameras. before I start, I need to mention that i did some paid consultancy work for Arca Swiss earlier this year, during which I rewrote the manual for the Arca-Swiss Monoball tripod heads.
I choose the Arca-Swiss F for several reasons: I like yaw free base tilt cameras, especially for architectural and studio work; the Arca Swiss F cameras are designed so that when you usethe rise/fall movements you do not need to refocus the camera-- the lens board and the film plane remain in the same plane they already were in, the ergonomics of the camera: the location of the controls and the overall feel of the camera; a very fine quality fresnel screen is built into the groundglass assembly (with all Sinars the fresnel is a detachable accessory); the proximity of the mass of the camera body to the tripod head; that the camera is much less bulky than a Sinar F, while having the stability and strength of the heavier 9and even bulkier) Sinar C cameras; it is easier to use with ultra wide angle lenses (lenses65mm and shorter) and that like the Sinar family of cameras it is a modular design that is basically infinitely expandable or contractable -- in several ways it is even more exandable: you can convert a 4x5 Arca-Swiss F-line into an 8x10 camera in about a minute and a half, or you can convert it to a 6x9cm camera in about a minute (of course you can always use a roll film back in the 4x5 configuration as well. Andthe Arca_Swiss binocular reflex viewer is the best I 've ever used, including Sinar's.
Weaknesses of the Arca-Swiss F-line cameras: Arca-Swiss is a much smaller company, what this means to you is that the distribution channels are not as robust. I have never had a problem with Arca-Swiss service, but I may be more patient than other people-- sometimes; and the lack of a bail on the groundglass mechanism.
The Linhof Technikardan TK45s is also a fine camera and bears consideration too.
Good luck!
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